Climbing to the top of Nhạn Mountain, visitors step out onto a wide brick-paved courtyard where the river breeze blows straight across the hill, facing a solitary square brick tower with no subsidiary shrines beside it. Its sole doorway opens to the east, while the other three sides feature blind false doors. Inside, the chamber is narrow and dim, holding a single incense altar beneath a corbeled brick vault that tapers high into the roof.
This is a kalan, a sanctuary of Cham Hinduism built around the late 11th to early 12th century. According to the heritage dossier of the Department of Cultural Heritage, the deity originally worshiped inside is the Cham goddess Pô Nagar. Vietnamese settlers who later came to pray inside the same tower addressed her by their own title, Thiên Y A Na Thánh Mẫu (Holy Mother Thiên Y A Na). Two layers of names and two liturgical traditions share a single chamber, and that living overlap is what matters most here.
IPô Nagar and Thiên Y A Na
The deity venerated here bears two layers of names that correspond to the two historical chapters of the monument. The earlier layer is Pô Nagar, written in the Department of Cultural Heritage dossier as Poh Inư Naga or Poh Naga, which translates from the Cham language as Mother of the Land (Poh meaning deity, Inư meaning mother, and Naga meaning land or realm). The later layer is Thiên Y A Na Thánh Mẫu, the title given by Vietnamese residents when they adopted worship at the site, popularly shortened to Bà (the Lady). In the Ê Đê and Gia Rai languages, the monument is called Yang Kơ Hmeng or Tháp Kơhmeng.
In the doctrine of Cham Hinduism, or Bàlamôn Cham, cosmic divine power has two aspects. The quiescent aspect belongs to the male deity, most often Shiva, while the dynamic creative energy, Shakti, is envisioned as a goddess. Pô Nagar embodies this second aspect, so within the Cham pantheon she is not a minor local spirit but the feminine manifestation of generative power. Cham tradition recounts that she brought forth the land and taught the people to cultivate rice, grow mulberries, raise silkworms, and weave cloth, the portrait of a founding deity and cultural teacher.
Alongside goddess worship, Cham temples commonly enshrined a Linga on a Yoni pedestal as the emblem of cosmic creation in Hinduism. At Nhạn Tower, the clearest surviving mark of that tradition sits at the very apex of the roof, a four-sided pointed monolithic stone pinnacle 1.4 meters high carved with eight lotus petals at its foot, read by scholars as a Linga form. In addition, the Department of Cultural Heritage dossier notes an interior altar pedestal in the 12th-century Tháp Mẫm style and a sandstone statue of the sacred bull Nandin depicting the head and neck joined to a rectangular body block discovered in the tower grounds.
On the Vietnamese side, the veneration of Thiên Y A Na arrived several centuries later. Vietnamese settlers moving into the lower Đà Rằng River plain from the 16th century onward did not build a separate shrine here but came to pray inside the existing Cham tower, addressing the goddess by a title familiar to their own tradition. The same process occurred at other Cham sanctuaries along the central coast, most notably at Ponagar Tower by the Cái River estuary.
In Vietnamese narratives, Thiên Y A Na is a heavenly maiden who descended to earth, was adopted by an elderly melon-farming couple, taught the people livelihoods, and later ascended back to heaven. In Cham narratives, Pô Nagar was born from clouds and sea foam, created the realm, and taught crafts to humanity. Though the two accounts differ in narrative detail, they converge on a single core figure, a maternal deity who shaped the land and taught people how to live upon it.
The library records both layers and does not rank one as more authentic than the other. The Cham layer built the monument and determined its architectural form. The Vietnamese layer kept the tower from becoming an abandoned ruin, because centuries of continuous pilgrimage preserved it as an active house of worship rather than a mere pile of ancient brick. The two layers rest one upon the other without replacing each other.
Two common misconceptions warrant clarification through historical evidence, without criticizing worshippers.
First, Nhạn Tower is not a Buddhist stupa. Because many visitors are familiar with multi-tiered funerary stupas in Buddhist pagodas, they sometimes assume this tiered brick structure holds relics or ashes. It does not. It is a kalan, an enclosed sanctuary of Cham Hinduism built to house a sacred emblem and host priestly rites, not a burial monument.
Second, the tower was not built by the Vietnamese. Because the chamber today contains a Vietnamese incense table and hosts Mother Goddess rites, some assume the building itself is a Vietnamese temple. The entire brick and stone structure was built by the Cham around the late 11th to early 12th century according to Hindu temple canons. The incense altar, offerings, and Mother Goddess ceremonies belong to a later liturgical layer placed inside a sanctuary built by another people and another religion.
IINine hundred years atop Nhạn Mountain
The heritage dossier of the Department of Cultural Heritage dates the construction of the tower to around the late 11th to early 12th century, placing it in the transitional phase between the Mỹ Sơn A1 architectural style and the Bình Định style. Because this date is established through stylistic comparison rather than a dated foundation inscription, visitors should read it as an approximate period rather than an exact year.
- Late 11th centuryKalan built on the mountain summitThe tower is erected on Nhạn Mountain, about 1.5 kilometers from the Đà Diễn estuary where the Đà Rằng River meets the sea, dedicated to the goddess Pô Nagar per the heritage dossier.
- From the 16th centuryVietnamese settlers adopt worship at the siteVietnamese pioneers settling the Phú Yên plain pray at the existing tower and address the deity as Thiên Y A Na Thánh Mẫu, establishing the Mother Goddess ritual tradition here.
- 1960First recorded stabilizationAfter centuries of weathering and root growth, the tower shaft is reinforced in the earliest restoration widely cited by historical sources.
- 1988National heritage rankingThe Ministry of Culture and Information ranks the tower as a national architectural and artistic heritage site on November 16, 1988. A few secondary articles write 1998.
- 1994 to 1999Major restoration of the exterior wallsSuccessive restoration campaigns take place from 1994, especially between 1997 and 1999. The Department of Cultural Heritage notes that newly restored exterior brick faces were recessed by 5 centimeters from the old wall plane so future observers could distinguish original brickwork.
- 2011Heritage introduction stele erectedA tympanum-shaped stele 2.9 meters high, 1.9 meters wide at the base, and 0.45 meters thick, with a red granite face measuring 0.9 by 1.9 meters, is erected behind the tower.
- 2018Special national heritage rankingRanked under Decision No. 1820/QĐ-TTg dated December 24, 2018 of the Prime Minister as the Nhạn Tower Architectural and Artistic Monument.
Sources record differing figures on two points, which are stated directly below.
Dimensions and height. The Department of Cultural Heritage dossier records the base platform as 12.2 meters per side, the main shaft as about 9 meters per side, the combined height of the base and shaft as 12.4 meters (excluding the roof), the stone pinnacle at the apex as 1.4 meters high, the interior chamber as 4.6 meters square, and the wall thickness as 2 to 2.5 meters. Meanwhile, an architectural study by architect Hoàng Xuân Thưởng in Tạp chí Kiến trúc (Architecture Magazine) gives a base height of about 3.3 meters, a shaft of 10.5 meters per side and 9.3 meters high, walls about 3 meters thick, a roof 8.5 meters high, an interior chamber of 4.5 meters per side, and a total height of about 24 meters (while other sources such as Dân Trí give 23.5 meters and a 10-meter square base). These sets of figures differ mainly in whether the three roof tiers and stone pinnacle are added to the base-and-shaft height, and where the tape is placed across the stepped moldings.
Year of national ranking. The provincial tourism portal and Wikipedia record November 16, 1988, whereas a few news articles write 1998. The library notes both dates for reference.
IIIA three-part square mass
Nhạn Tower is a square structure built in the classic three vertical divisions of a kalan, namely base, body, and roof. The base flares outward slightly through stepped moldings, the square shaft features five engaged pilasters (including the two corner pilasters) on each face dividing the wall into vertical bays, and the roof rises through three diminishing tiers capped by a monolithic stone pinnacle.
Only one doorway opens to the east. According to the Department of Cultural Heritage, the projecting front vestibule originally extended 3 meters outward but collapsed, leaving a doorway 2.4 meters high topped by a stepped corbeled arch.
The other three faces of the shaft and all four faces of each roof tier bear false doors. In the early 20th century, H. Parmentier still observed carvings of Makara sea monsters tearing at serpents above the false doors, where today only four-sided truncated stone pillars remain on either side.
Each face of the shaft has five plain pilasters without floral carving, and the walls are 2 to 3 meters thick. Inside, the 4.5-to-4.6-meter square chamber rises through stepped corbeled courses that meet at a single top brick, giving the interior the profile of a bell.
Three roof tiers diminish upward, each corner ornamented with miniature multi-tiered tower forms. Restoration work recovered 11 fallen stone corner pinnacles of various sizes.
The roof culminates in a four-sided pointed monolithic stone pinnacle 1.4 meters high, carved with 8 lotus petals around its base as a Linga emblem.
A square courtyard measuring 38 meters per side surrounds the foot of the tower, paved with 40-by-40-centimeter brown tiles, providing ample space for circumambulation and festival offerings.
Bricks laid tight without visible mortar joints
The entire shaft is built of fired bricks laid so tightly that the naked eye can hardly detect a mortar joint. How Cham masons bonded their brickwork remains an open question in scholarship, and Nhạn Tower is one of the monuments most frequently cited in that debate. According to Tạp chí Kiến trúc, leading hypotheses include grinding the brick faces flat against one another and bonding them with a thin botanical resin refined from the dầu rái (Dipterocarpus) tree, or molding and lightly firing the bricks once so they remained soft enough to carve in place before firing the entire assembled tower a second time.
Even the brick dimensions vary across sources. The Department of Cultural Heritage dossier and Dân Trí record bricks measuring about 40 centimeters long, 20 centimeters wide, and 8 centimeters thick. The study in Tạp chí Kiến trúc records bricks 33 centimeters long, 10.5 centimeters wide, and 8.1 centimeters thick, laid with their length keyed deep into the wall core in an interlocking pattern without aligned vertical joints. Because these differences likely reflect measurements taken across original and restored wall sections, the library records both sets of numbers.
Equally notable is how the tower anchors itself into the mountain. Built on the eastern slope near the crest of Nhạn Mountain, which rises about 60 to 64 meters above sea level with a basal perimeter of roughly 1.5 kilometers, the tower uses the natural bedrock of the hill as its foundation, a structural advantage unavailable to towers built on alluvial plains.
IVThe lie of the land and orientation
One point should be stated plainly from the start. Hinduism does not teach feng shui. Feng shui is an East Asian system of spatial divination, and the Cham did not use it when choosing this mountain. Opening the sole true doorway faces east follows the sacred canon of Hindu temple architecture, in which east is the direction of the rising sun whose first rays must enter the doorway and touch the sacred emblem inside. What follows below is a comparative reading by the library for readers familiar with traditional Vietnamese spatial thought, not anything written in Cham inscriptions or intended by the original builders.
Read through traditional Vietnamese geomancy, the first striking feature is a mountain stance beside a great river. The tower stands atop Nhạn Mountain on the northern bank of the Đà Rằng River, bordered along the southern foot of the hill by Bạch Đằng Street and the Chùa River (a branch of the Đà Rằng), about 1.5 kilometers from the Đà Diễn sea estuary. In geomantic terms, this recalls the classic configuration of a backing mountain behind and water in the bright hall (minh đường) in front, where the hill itself provides support and the broad river below forms an open forecourt leading out to the East Sea. Classical manuals regard a river mouth near the sea as a zone of vigorous, dynamic qi, suited for temples and shrines rather than ordinary dwellings.
Second is the eastern orientation. In traditional Sino-Vietnamese geomancy, east belongs to the Wood element and corresponds to the rising vitality of morning, so a temple facing east is read as receiving ascending qi. Hindu temple architecture chooses east for a different reason altogether, so that the first light of dawn strikes the sacred emblem in the sanctum. Two distinct traditions arrive at the same compass direction through entirely separate lines of reasoning, and the value of comparing them lies in recognizing that difference rather than conflating them.
Third is the ascent. Traditional Vietnamese geomancy reads the lie of the land horizontally along a front-to-back axis across courtyards. Here the sanctuary is organized vertically, requiring worshippers to climb the mountain slope before reaching the temple court. While a traditional eye might compare this to the stepped ascent of a mountain Buddhist pagoda representing stages of self-cultivation, the Hindu architectural reason is different, placing the sanctuary on the highest prominence so the tower itself stands as the cosmic mountain Meru.
Finally, two ways of reading the landscape meet without becoming one. Vietnamese residents have prayed here for generations, and in local speech Nhạn Mountain and the Đà Rằng River form a quintessential mountain-and-water pair. That local perception is real and worth recording, yet it represents how Vietnamese communities read an existing monument, not why the Cham chose this hill. The library notes both perspectives and leaves the distinction clear.
VThe Lady Festival in the third lunar month
Unlike many Cham towers that now stand as silent ruins, Nhạn Tower hosts an active annual festival. The largest observance is Lễ vía Bà (the Lady Festival), held in the 3rd lunar month. Sources record slightly different date spans, as the Department of Cultural Heritage dossier states that the festival runs from the 20th to the 23rd day of the 3rd lunar month (with the 21st as the main feast day and the 23rd also marked as a major observance), Đắk Lắk provincial news reports on the 2025 festival record the 20th to the 22nd, and Tạp chí Kiến trúc writes the 21st to the 23rd. The library records all three spans so visitors have the full picture.
| Festival stage | Location | Description |
|---|---|---|
| Bathing rite (Lễ mộc dục) | Inside the tower chamber | Cleansing and tidying the sanctuary, changing ceremonial robes and altar hangings to open the festival. |
| Traditional sacrificial rite (Lễ tế cổ truyền) | Courtyard in front of the eastern doorway | The ritual team performs classical Vietnamese ceremonial prostrations and reads a formal eulogy honoring the Holy Mother. |
| Pilgrim offerings and Cham dances | Tower courtyard and inner chamber | Pilgrim delegations of 30 to 50 people from inside and outside the province offer fruit, farm produce, betel, rice, and salt. Cham delegations from former Ninh Thuận and Bình Thuận attend in traditional attire and perform sacred dances. |
| Spirit possession and chầu văn chant | Festival courtyard | Ritual performance belonging to the Vietnamese Mother Goddess tradition, recounting the merits of the Mother of the Land through song and dance. |
| Distributing blessed offerings (Phát lộc) | Tower courtyard | Offerings such as betel, fruit, cakes, rice, and salt are shared among attendees after the rites. |
| Lantern Festival Poetry Night (Hội thơ Nguyên tiêu) | Nhạn Mountain courtyard | Separate from the Lady Festival. A longstanding literary gathering of the Tuy Hòa community held on the full moon of the 1st lunar month right on the tower courtyard. |
One distinction regarding the table above should be kept clear, namely that most of these stages belong to Vietnamese liturgical practice within the Mother Goddess tradition, joined by visiting Cham pilgrim delegations. The bathing rite (lễ mộc dục) is where the two traditions come closest, as washing the sanctum and changing sacred vestments has deep roots in Cham temple ritual while also matching the Vietnamese custom of renewing the robes of the Holy Mother. Pointing out this boundary is not meant to divide the two communities, but to help visitors recognize which historical layer they are witnessing on the summit of Nhạn Mountain.
VILocation And How To Get There
- Address
- Núi Nhạn, phường Tuy Hòa (phường 1 cũ, thành phố Tuy Hòa cũ, tỉnh Phú Yên cũ), tỉnh Đắk Lắk
- Getting there
- The tower stands on Nhạn Mountain in Tuy Hòa Ward, Đắk Lắk Province (formerly Ward 1, Tuy Hòa City, Phú Yên Province), on the northern bank of the Đà Rằng River about 1.5 kilometers from the Đà Diễn estuary. The summit can be reached by road or footpath from the ward center.
- Coordinates
- 13.0823, 109.3017
Because this monument is both a protected heritage site and an active place of worship, two sets of etiquette apply simultaneously. As a sanctuary, visitors are expected to dress modestly, remove hats before stepping into the chamber, and avoid standing in the sole eastern doorway while others are praying. As an ancient monument, visitors should not touch or lean against the brickwork, wedge incense sticks into wall joints, or climb onto the stepped base. During the festival in the 3rd lunar month, pilgrim delegations enter in turns, so visitors should yield the doorway to groups performing rites.
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?Quick Questions
Who is worshiped at Nhạn Tower?
According to the Department of Cultural Heritage dossier, the tower was originally built to worship the Cham goddess Pô Nagar (Poh Inư Naga, meaning Mother of the Land). Vietnamese settlers later adopted worship at the tower and addressed her as Thiên Y A Na Thánh Mẫu (Holy Mother Thiên Y A Na). The two layers of veneration coexist without replacing each other.
Is Nhạn Tower a Buddhist pagoda or a Hindu temple?
It is not a Buddhist pagoda. It is a kalan, an enclosed sanctuary of Cham Hinduism built around the late 11th to early 12th century to house a sacred emblem and host priestly rites. Although its tiered roof resembles funerary stupas in Buddhist temples, Cham towers were never used to store ashes or relics.
How tall is Nhạn Tower?
The Department of Cultural Heritage dossier records a base platform of 12.2 meters per side, a shaft of 9 meters per side, a combined base-and-shaft height of 12.4 meters (excluding the roof), and a 1.4-meter stone pinnacle at the top. Sources that measure the entire structure including the roof, such as Tạp chí Kiến trúc and Dân Trí, give a total height of 23.5 to 24 meters.
When does the Lady Festival at Nhạn Tower take place?
Every year in the 3rd lunar month. The Department of Cultural Heritage dossier gives the 20th to the 23rd day of the 3rd lunar month (with the 21st as the main feast day), 2025 local press reports give the 20th to the 22nd, and other sources give the 21st to the 23rd. The festival includes the bathing rite, traditional sacrificial rites, pilgrim offerings and Cham dances, spirit possession rites, and the distribution of blessed offerings.
What sits on the very top of Nhạn Tower?
According to the Department of Cultural Heritage, the apex of the roof is crowned by a four-sided pointed monolithic stone pinnacle 1.4 meters high, carved with 8 lotus petals around its base, representing the Linga emblem of creative power in Hinduism.