Stand before the unpainted cypress gateway of the Worship Place (Haisho) at the northern edge of Daisen Park in Sakai City, Osaka Prefecture, and you see a tranquil moat reflecting white herons and a dense primeval forest island rising like a natural hill. Yet rise a few hundred meters into the sky and look down, and that wooded hill reveals itself as a breathtaking work of geometric earthwork architecture: a colossal keyhole-shaped burial mound (Zempō-kōen-fun) measuring 486 meters in length, enclosed by three concentric water moats that bring its total length to 840 meters and its width to 654 meters in the heart of a modern city.
Ranked alongside the Great Pyramid of Khufu in Egypt and the Mausoleum of the First Qin Emperor in China as one of the three greatest tombs of antiquity, this monument is the Mozu Tomb of Emperor Nintoku (Japanese: Nintoku-tennō-ryō Kofun, 仁徳天皇陵古墳, known archaeologically as Daisen-ryō Kofun or Daisen Kofun). Both the supreme engineering achievement of fifth-century Kofun Japan and a living Imperial Mausoleum of Ancestor Veneration administered by the Imperial Household Agency (Kunaichō), it honors the benevolent sovereign remembered for remitting taxes for three years when he saw no cooking smoke rising from his people's hearths.
IEmperor Nintoku, the legend of the people's hearth smoke, and Imperial mausoleum rites
In the official register of Imperial Mausolea maintained by the Imperial Household Agency of Japan (Kunaichō) and in the eighth-century chronicles Kojiki (712 CE) and Nihon Shoki (720 CE), this great tumulus bears the formal title Mozu no Mimi-hara no Naka no Misasagi (百舌鳥耳原中陵, Central Mausoleum of Mozu Ear-Plain), the resting place of Emperor Nintoku (仁徳天皇, personal name Ōsazaki-no-Mikoto). In the traditional imperial lineage, Emperor Nintoku was the sixteenth sovereign of Japan (fourth son of Emperor Ōjin, whose own giant keyhole tomb stands in the nearby Furuichi cluster) and ruled from the palace of Naniwa Takatsu-no-Miya in present-day Osaka.
The reason this ancient monarch received the posthumous title Nintoku (literally 'Benevolent Virtue') and has been revered for over a millennium lies in the famous account of the Smoke from the People's Hearths (Tamikama no Kemuri, 民のかまど) recorded in Book 11 of the Nihon Shoki.
According to the Nihon Shoki, in the fourth year of his reign Emperor Nintoku climbed a high tower of his palace in Naniwa and looked out across the land in all four directions. Noticing that no cooking smoke was rising from the houses in the plains below, he realized that the common people had fallen into such poverty that they had no grain to cook in their pots. The Emperor immediately issued an edict suspending all taxes and compulsory corvée labor across the realm for three full years. Throughout those three years, his own palace went unrepaired: the thatched roof rotted until rain leaked onto the imperial robes and starlight shone through the rafters, yet the sovereign refused to burden the people.
Three years later, when the Emperor and Empress ascended the tower again, thick plumes of cooking smoke were rising from every village across the plain. Turning to the Empress, Nintoku spoke the words that became a touchstone of East Asian statecraft: We are now prosperous! For a sovereign's wealth is none other than the sufficiency of the people. When the people are rich, the ruler is rich. His reign is also credited in the chronicles with Japan's earliest monumental civil-engineering works: digging the Naniwa-no-Horie canal to drain the Kawachi wetlands into Osaka Bay, building the Mamuta Embankment (Mamuta no Tsutsumi) along the Yodo River, and opening vast tracts of irrigated farmland using the same earth-moving mastery seen in the great Kofun mounds.
Within the tradition of Japanese Imperial Ancestor Veneration (Kōshitsu Saishi), Imperial Mausolea (Misasagi, 陵) are not treated as abandoned archaeological ruins, but as active sacred sanctuaries housing the spirits of imperial ancestors descended from the Sun Goddess Amaterasu. At the Worship Place (Haisho) on the southern shore of the Tomb of Emperor Nintoku, the Imperial Household Agency maintains year-round guardianship and seasonal rituals: whenever a new Emperor ascends the throne (such as Emperor Naruhito's enthronement rites in 2019), when imperial marriages occur, and on the traditional memorial anniversary of Emperor Nintoku's passing, Imperial Envoys (Chokushi) in classical court dress travel to the Sakai worship court to present Heihaku offerings and read ritual reports.
Even the place name Mozu (百舌鳥, meaning the bull-headed shrike) derives from a sacred omen recorded in the Nihon Shoki when construction of the mausoleum began in the winter of the 67th year of Nintoku's reign: as laborers cleared the Ishizuhara plain to lay out the tomb, a wild deer suddenly leaped from the grass and dropped dead. Examining the deer, workers saw a shrike (Mozu) fly out from the deer's lacerated ear. Taking this as a sign from the local deities, the Emperor named the plain Mozu no Mimi-hara (Plain of the Shrike and the Deer's Ear).
In international scholarship and Japanese textbooks, readers encounter two names for this monument side by side: Nintoku-tennō-ryō Kofun (Tomb of Emperor Nintoku) and Daisen-ryō Kofun or Daisen Kofun. Why do both names exist, and how are they understood? Because Imperial Mausolea are protected as active ancestral graves by the Imperial Household Agency and excavation of the central burial chamber is prohibited, no contemporary fifth-century inscription has been recovered from inside the coffin to confirm the occupant's personal name, meanwhile, typological dating of the Haniwa terracotta cylinders places the mound's construction in the mid-fifth century CE.
Consequently, archaeologists often refer to the site neutrally after the surrounding Daisen neighborhood as Daisen Kofun (大山古墳 or 大仙陵古墳), whereas the Imperial Household Agency, the citizens of Sakai, and over a millennium of historical tradition call it Nintoku-tennō-ryō Kofun (Mausoleum of Emperor Nintoku). When inscribing the site on the World Heritage List in 2019, UNESCO recognized both perspectives by recording both its traditional Imperial attribution and its archaeological designation.
IIFrom a 5th-century earthwork megaproject to UNESCO World Heritage (2019)
The history of the Mozu Tomb of Emperor Nintoku reflects the zenith of early kingship during the Kofun period (mid-3rd to 6th century CE), when the Great Kings (Ōkimi, precursor to the title Tennō) of the Yamato court displayed their unifying authority across the archipelago by raising monumental earthen mounds overlooking Osaka Bay.
- Mid-5th century CEConstruction of the 1.4-million-cubic-meter mound over more than 15 yearsBuilt during the middle Kofun period (contemporary with the Five Kings of Wa recorded in Chinese dynastic histories), the tomb was raised on the Mozu plateau overlooking Osaka Bay. Engineering simulations by Obayashi Corporation estimate that using fifth-century hand tools to move 1.4 million cubic meters of soil and fire over 20,000 Haniwa figures required up to 2,000 workers laboring daily for 15 years and 8 months (roughly 6.8 million workdays).
- 720 to 927Official recording in the Nihon Shoki and the Engishiki codeIn 720, the Nihon Shoki recorded the start of the tomb's construction at Mozu no Mimi-hara in Nintoku 67 and the Emperor's burial there in Nintoku 87. In 927 (Engi 5), the Heian administrative code Engishiki (Bureau of Imperial Mausolea) formally registered Mozu no Mimi-hara no Naka no Misasagi as the Imperial Mausoleum of Emperor Nintoku.
- Warring States to Edo periodProtection by Sakai townspeople and Tokugawa shogunate restorationsThroughout the medieval era near the flourishing port city of Sakai, local residents protected the wooded mound as sacred ground. During the Edo period, under the Genroku and Bunkyū imperial mausoleum restorations (1862 to 1865), the Tokugawa shogunate dredged the moats, repaired the embankments, and built the southern worship court.
- 1872 (Meiji 5)A storm landslide on the front mound exposes a stone coffin and gilt-bronze armorIn September 1872, heavy storm rains caused a small landslide on the front square section (Zempō-bu) of the mound, exposing a stone chamber containing a 2.7-meter chest-shaped stone coffin (Nagabako-gata Sekkan) along with gilt-bronze iron armor, a helmet, iron swords, a blue glass vessel, and a bronze mirror. After Sakai Governor Saisho Atsushi commissioned detailed drawings, the chamber was resealed to preserve the mausoleum.
- 1896 to 1900Re-excavation and restoration of the outer third moat (Sanjū-bori)At the end of the 19th century, based on clear topographical traces of the ancient outer moat that had silted into farmland over the centuries, Sakai and imperial authorities re-excavated the third moat (Sanjū-bori), restoring the triple-moated appearance seen today.
- 1952Rediscovery of the 1872 watercolor drawings and study of outer-bank artifactsDetailed 1872 color illustrations painted on site by antiquarian Kashiwagi Kaichirō, together with Haniwa and bronze pieces from the outer embankments preserved in Japanese and Boston collections, provided critical scientific evidence confirming the tomb's mid-fifth-century date.
- 2018First joint archaeological survey by the Imperial Household Agency and Sakai CityIn October 2018, for the first time in modern history, the Imperial Household Agency partnered with Sakai City archaeologists to conduct a conservation excavation along the inner embankment (Daiichi Tsutsumi), uncovering rows of cylindrical Haniwa standing in situ atop a cobblestone pavement.
- 2019Inscription as a UNESCO World Heritage SiteOn July 6, 2019, at its 43rd session in Baku, Azerbaijan, the UNESCO World Heritage Committee inscribed the Mozu Tomb of Emperor Nintoku and 48 associated mounds as the World Heritage Site 'Mozu-Furuichi Kofun Group: Mounded Tombs of Ancient Japan.'
In comparative world archaeology, the Mozu Tomb of Emperor Nintoku is frequently measured alongside two other monumental royal tombs of antiquity: the Great Pyramid of Khufu (Cheops) at Giza in Egypt (146.6 meters high, 230 meters along each base side) and the Mausoleum of the First Qin Emperor (Qin Shi Huang) in Xi'an, China (central mound roughly 350 meters square). While Khufu's pyramid stands tallest vertically, in terms of the horizontal length of the burial mound itself (486 meters) and the total footprint of the mausoleum complex including its three concentric moats (840 meters long, 654 meters wide, covering roughly 464,000 square meters with a 2.85-kilometer outer perimeter path), the Mozu Tomb of Emperor Nintoku ranks among the largest funerary monuments by surface area ever constructed in the ancient world.
IIIThree-tiered keyhole architecture (Zempō-kōen-fun) and 20,000 Haniwa figures
The Mozu Tomb of Emperor Nintoku is the supreme masterpiece of a funerary architectural form unique to ancient Japan (with a few related examples on the southern Korean Peninsula): the Zempō-kōen-fun (前方後円墳, literally 'front-square and rear-round tomb,' whose trapezoidal front section joined to a circular rear mound forms a giant keyhole silhouette when viewed from the air). In Kofun-period cosmology and state ritual, the rounded rear mound (Kōen-bu, symbolizing the dome of Heaven) housed the stone burial chamber of the deceased Great King, while the flared rectangular front mound (Zempō-bu, symbolizing the square Earth) served as a monumental ceremonial stage where rites of royal succession and ancestral offerings were performed.
The central earthen mound was built in three stepped tiers (Sandan Chikusei, 三段築成). When newly completed in the fifth century, the mound was not covered in dense forest as it is today: the slopes of all three earthen tiers were paved completely with millions of gray-white river cobbles (Fukiishi, 葺石) hauled from the nearby Ishizu River, preventing erosion and causing the entire artificial mountain to gleam bright white in the sunlight to ships sailing across Osaka Bay.
The central mound alone stretches 486 meters in length. Its circular rear section (Kōen-bu, to the north) measures 249 meters in diameter and rises 35.8 meters high (the height of a 12-story building), while its flared front rectangular section (Zempō-bu, facing south) widens to 307 meters across and stands 33.9 meters high. Projecting into the inner moat from both the eastern and western waists where the round and square sections meet are two rectangular ceremonial platforms called Tsukuridashi (造出).
Surrounding the central mound are three broad concentric water moats (First, Second, and Third Moats) separated by tree-lined earthen embankments. Dug both to supply earth for the mound and to create a triple watery boundary separating the realm of the living from the sacred resting place of the sovereign, the outer moat is ringed by more than ten smaller satellite mounds (Baichō, such as Chayama Kofun and Daianjiyama Kofun) built for royal kinsmen, retainers, or grave goods.
Along the three stepped terraces of the central mound, atop the Tsukuridashi platforms, and along the surrounding moat embankments, fifth-century potters fired and set in continuous rows between 20,000 and 30,000 unglazed reddish terracotta sculptures known as Haniwa (埴輪). Most were cylindrical Haniwa marking sacred boundaries, interspersed with representational Haniwa depicting shrine maidens (Miko), armored warriors, horses, waterfowl, houses, and boats.
Centered on the southern bank of the outer moat facing the front of the rectangular Zempō-bu mound is the Worship Place (Haisho), spread with clean white gravel and framed by an unpainted cypress gate and fence. This is the ceremonial court where Imperial Envoys and everyday visitors stand to bow in veneration across the water.
Immediately south of the mausoleum inside Daisen Park stand the Sakai City Museum and the Mozu Kofun World Heritage Visitor Center. Here visitors can experience high-definition aerial virtual reality (VR) tours over the keyhole mound and view original fifth-century Haniwa sculptures (including the famous terracotta head of a maiden and horse figures), scale models, and replicas of the 1872 gilt-bronze armor.
| Architectural Feature or Artifact | Dimensions and Date | Archaeological Notes |
|---|---|---|
| Total length and width of the complex (including 3 moats) | 840 meters long by 654 meters wide | Total area approx. 464,000 to 470,000 m², outer perimeter walking path approx. 2.85 km |
| Length of the central keyhole mound alone | 486 meters | The longest of the more than 160,000 ancient Kofun burial mounds across Japan |
| Rear Round Section (Kōen-bu) and Front Square Section (Zempō-bu) | 249 m diameter (35.8 m high) and 307 m wide (33.9 m high) | Constructed in 3 stepped tiers from approx. 1.4 million m³ of earth, originally paved in Fukiishi cobbles |
| Terracotta Haniwa Sculptures | Mid-5th century CE (estimated 20,000 to 30,000 pieces) | Cylindrical Haniwa and representational Haniwa (maidens, warriors, horses, houses) lining the tiers and dikes |
| Stone Coffin and Gilt-Bronze Iron Armor in the Front Mound | Mid-5th century CE (exposed in 1872) | Revealed by a storm landslide in Meiji 5 (1872), documented in detailed drawings, and resealed in place |
| Surrounding Satellite Tombs (Baichō) | 5th century CE | Over 10 smaller round and keyhole mounds ringing the outer moat (9 inscribed as UNESCO component sites) |
IVThe lie of the land and the facing
First, the historical context must be stated clearly: in the mid-fifth century CE when the Mozu Tomb of Emperor Nintoku was built, Chinese Tang-Song compass geomancy had not yet been introduced to Japan (the Bureau of Yin and Yang, Onmyōryō, was established later in the seventh century under Emperor Tenmu). The siting and orientation of the giant Mozu Kofun mounds in Sakai arose from the maritime and royal spatial planning of the early Yamato state: raising artificial mountains along the coastal bluff overlooking Osaka Bay so that diplomatic and merchant ships arriving from Korea, China, and western Japan would behold the majesty of the Great Kings as soon as they entered the bay. The analysis below offers a comparative reading through the traditional geomantic lens of the Hall of Myriad Paths library, examining how the Mozu plateau and its triple moats align with classical East Asian principles of yin-dwelling (funerary) land forms.
Viewed across the macro-topography of the Kinki (Kansai) region, the city of Sakai and the Mozu Kofun cluster (where the Tomb of Emperor Nintoku stands at coordinates 34.5639° N, 135.4873° E) occupy a raised Pleistocene clay-and-gravel coastal terrace (the Uemachi-Senboku plateau, 16 to 20 meters above sea level) running along the eastern shore of Osaka Bay (Osaka-wan). Rising to the east and southeast are the Kongō and Katsuragi mountain ranges acting as the distant Ancestral Mountains (thái tổ sơn) separating Sakai from the Nara basin, from which the Ishizu and Yamato rivers flow westward to embrace the northern and southern flanks of the Mozu plateau before emptying into Osaka Bay. In classical Flatland Dragon (Bình Yang Long) geomancy, a dry, elevated terrace of firm earth rising above surrounding lowlands and looking out over a calm bay exemplifies the maxim an inch higher is a mountain, an inch lower is water, marking a prime sovereign node.
In terms of facing and geometric form, the main axis of the keyhole mound is oriented north-northeast to south-southwest (angled roughly 20 degrees from true north): the taller circular rear mound (Kōen-bu, 35.8 meters high, housing the royal burial chamber) sits in the north-northeast, while the flared rectangular front mound (Zempō-bu, 307 meters wide) opens toward the south-southwest where the Worship Place stands (sitting North-Northeast and facing South-Southwest). In traditional form symbolism, the front-square, rear-round silhouette resembles a great bronze bell (Golden Bell node) or a sovereign's jade seal set firmly upon the earth: the rounded northern crown gathers heavenly qi, while the broad southern front opens as an inner bright hall (Bright Hall (Ming Tang)) receiving the southern sunlight and the homage of the realm.
Most striking of all is the water geomancy of the three concentric water moats (San-jū Shūgō) completely encircling the mound. Classical funerary theory holds that vital qi travels through the earth and halts and accumulates where it meets water (qi scatters in wind and stops at water). On a flat coastal plateau lacking high surrounding peaks to block the wind, fifth-century engineers dug three broad rings of water around the mound to create an artificial Triple Jade-Girdle Water (Tam Trùng Ngọc Đái Water) enclosure: locking the dragon qi securely within the central island while creating a tranquil microclimate that has sustained a self-contained primeval forest for over 1,500 years in the middle of urban Sakai.
VImperial mausoleum rites and the Mozu Futon-daiko drum-float festival
Official ceremonies at the Mozu Tomb of Emperor Nintoku follow the Gregorian calendar (alongside the traditional lunisolar harvest moon for local festivals), combining solemn imperial ancestral rites conducted at the Worship Place with vibrant neighborhood festivals in Sakai celebrating the ancient sovereign's legacy.
| Date | Calendar | Rite or Festival | Description |
|---|---|---|---|
| February 7 (traditional memorial date: 16th day of the 1st lunar month) | Gregorian | Annual Imperial Memorial Rite for Emperor Nintoku (Shōtōsai) | An official ceremony conducted by officials of the Imperial Household Agency (Kunaichō) at the southern Worship Place (Haisho) offering ritual tribute on the anniversary of the 16th Emperor's passing. |
| Centennial Years (Shikinen-sai) and Imperial Enthronements | Gregorian | Visitation of the Imperial Envoy (Chokushi Sankō) | Whenever a new Emperor ascends the throne or on major centennial anniversaries of Emperor Nintoku's passing, a special Imperial Envoy dispatched from Tokyo visits the Sakai Worship Place to present offerings and read an imperial message. |
| Saturday and Sunday nearest the Harvest Moon (September or early October) | Gregorian (linked to the 8th lunar month full moon) | Mozu Hachimangū Moon-Viewing Festival and Futon-daiko Drum Floats | A 300-year-old autumn festival at Mozu Hachimangū Shrine just east of Emperor Nintoku's tomb: nine neighborhoods carry massive 2-ton wooden drum floats topped with five tiers of red gold-embroidered cushions (Futon-daiko) on the shoulders of 70 men each. |
| 3rd Sunday of October | Gregorian (movable) | Sakai Festival Grand Pageant (Sakai Matsuri) | Sakai City's largest annual cultural festival featuring a grand historical parade connecting fifth-century Kofun heritage, sixteenth-century merchant culture and tea master Sen no Rikyū, and Futon-daiko floats. |
For the citizens of Sakai, Emperor Nintoku's benevolent ideal of caring for the people's hearths remains a living civic symbol celebrated in local songs and schools. Every autumn around the harvest full moon, just a few hundred meters east of the tomb's outer moat at Mozu Hachimangū Shrine (founded in the sixth century to guard the Mozu district), thunderous drums announce the Futon-daiko Festival (ふとん太鼓). Towering wooden palanquins nearly four meters high, crowned with five inverted-pyramid tiers of scarlet cushions embroidered in gold dragons (evoking the square earth platform of a Kofun mound), are borne on the shoulders of seventy men chanting Bera-bera-berasshoi beneath the autumn moon in a tradition uniting the neighborhoods around the Imperial Mausoleum.
VILocation And How To Get There
- Address
- Từ ga JR Shin-Osaka hoặc ga JR Tennoji (trung tâm Osaka)
- Getting there
- From JR Shin-Osaka Station or JR Tennoji Station in central Osaka, take the JR Hanwa Line to JR Mozu Station (only about 7 minutes from Tennoji on a local train). From JR Mozu Station, walk 5 to 8 minutes west through Daisen Park directly to the southern Worship Place of the Tomb of Emperor Nintoku. Alternatively, take the Nankai Kōya Line from Namba Station to Mikunigaoka Station or Sakai-higashi Station.
- Coordinates
- 34.5639, 135.4873
Because the Mozu Tomb of Emperor Nintoku is both an active Imperial Mausoleum administered by the Imperial Household Agency and a UNESCO World Heritage Site, crossing the moats onto the central burial mound is strictly prohibited. When visiting the Worship Place (Haisho) on the southern side, please maintain a respectful demeanor and bow quietly as at an ancestral resting place. The shaded pedestrian path encircling the outer third moat is 2.85 kilometers long, level, and peaceful (taking about 45 to 50 minutes to walk a full circuit). To view the complete keyhole shape from above, visitors can experience the aerial VR theater at the Mozu Visitor Center beside the Worship Place or visit the free 21st-floor Observation Lobby of Sakai City Hall near Sakai-higashi Station.
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?Quick Questions
How large is the Mozu Tomb of Emperor Nintoku?
Located in Sakai City (Osaka Prefecture), the Mozu Tomb of Emperor Nintoku (Nintoku-ryō Kofun, or Daisen Kofun) is the largest keyhole-shaped burial mound in Japan and one of the three largest ancient tombs by surface area in the world, alongside the Great Pyramid of Khufu in Egypt and the Mausoleum of the First Qin Emperor in China. The three-tiered central mound alone is 486 meters long and 35.8 meters high, and when its three concentric water moats are included, the complex measures 840 meters in length, 654 meters in width, and roughly 464,000 square meters in area.
Who was Emperor Nintoku and what historical story is he famous for?
According to the ancient chronicles Kojiki and Nihon Shoki, Emperor Nintoku was the 16th sovereign of Japan, who ruled from Takatsu Palace in Naniwa (modern Osaka). He is revered as a model of benevolent rule through the story of the Smoke from the People's Hearths (Tamikama no Kemuri): looking out from his palace tower and seeing no cooking smoke rising from the villages, he realized the people were impoverished and abolished all taxes and forced labor for three years, living under a leaking roof until smoke rose once more from every hearth.
Why was the tomb built in the shape of a keyhole (Zempō-kōen-fun)?
The keyhole-shaped mound (Zempō-kōen-fun, combining a flared square front with a circular rear mound) was the distinctive monumental tomb form of Japan's ruling elite during the Kofun period from the 3rd to the 6th century CE. The circular rear mound housed the stone burial chamber of the deceased sovereign, while the rectangular front mound served as a ceremonial platform for royal succession rites, visually expressing the cosmology of Round Heaven and Square Earth and the political rank of the Yamato court.
Can visitors enter the Tomb of Emperor Nintoku, and where is the best place to see its keyhole shape?
Because the tomb is a sacred Imperial Mausoleum managed by the Imperial Household Agency (Kunaichō), no one is permitted to cross the moats onto the central mound. Visitors pay their respects at the southern Worship Place (Haisho) and walk the 2.85-kilometer tree-lined path around the outer moat. To see the keyhole shape from above, visitors can ride up to the 21st-floor Observation Lobby of Sakai City Hall or experience the aerial VR tour at the Mozu Visitor Center and Sakai City Museum in Daisen Park.
When was the Mozu Tomb of Emperor Nintoku inscribed as a UNESCO World Heritage Site?
On July 6, 2019, at the 43rd session of the UNESCO World Heritage Committee, the Mozu Tomb of Emperor Nintoku together with 48 other representative burial mounds in Sakai, Habikino, and Fujiidera (Osaka Prefecture) was officially inscribed on the World Heritage List under the title 'Mozu-Furuichi Kofun Group: Mounded Tombs of Ancient Japan.'