Unduvap Poya falls on the December full moon and holds a distinctive place in Sri Lanka's Buddhist calendar as the final Poya day of the year. It commemorates one of the most consequential voyages in the island's religious history — the arrival of Sangamitta Theri, daughter of Emperor Asoka of India, bearing a sapling from the sacred Jaya Sri Maha Bodhi tree. That single act of devotion shaped Sri Lanka's spiritual landscape for over two millennia and continues to draw tens of thousands of pilgrims to Anuradhapura every December.
Who was Sangamitta Theri?
Sangamitta Theri was the daughter of Emperor Asoka, the Mauryan ruler who championed the spread of Buddhism across Asia, and the sister of Arahant Mahinda — the monk credited with bringing Buddhism to Sri Lanka on Poson Poya day. She was a fully ordained Bhikkhuni (Buddhist nun) of great learning, and her mission to Sri Lanka was undertaken at the request of King Devanampiyatissa, who ruled the island during the third century BCE.
Her voyage carried both a spiritual relic and a living symbol: a sapling propagated from the southern branch of the Bodhi tree in Bodh Gaya, India — the very tree under which the Lord Buddha attained enlightenment. This sapling was transported carefully in a golden bowl to preserve its sanctity throughout the sea crossing.
Where did Sangamitta Theri land in Sri Lanka?
The vessel carrying Sangamitta Theri and her retinue docked at Dambakolapatuna, a port on the northern coast near present-day Jaffna, on an Unduvap full moon day. A large gathering of royalty and clergy received her, and the procession that carried the Bo sapling south to Anuradhapura is described in detail in the Mahavamsa, Sri Lanka's ancient chronicle.
The sapling was subsequently planted in the Mahameuna (Mahamevnawa) Garden in Anuradhapura, where it took root and grew into the Sri Maha Bodhi — the oldest historically documented tree in the world, now over 2,300 years old. Saplings from this tree were later distributed across the island, carrying both the botanical lineage and the Buddhist symbolism to every corner of Sri Lanka.
What else did Sangamitta Theri bring to Sri Lanka?
Her arrival was transformative in ways that extended well beyond the physical Bo sapling. Sangamitta Theri established the Bhikkhuni Sasana in Sri Lanka during the month of Unduvap, creating the formal order of Buddhist nuns and opening the monastic path to women for the first time on the island.
The retinue that accompanied her also included skilled practitioners in a wide range of disciplines — woodworking, agriculture, indigenous medicine, and other crafts. Their knowledge was shared with local communities, and the Mahavamsa records that these skills were assimilated into Sri Lankan society, contributing to the island's cultural and material development over subsequent generations. In this sense, Unduvap Poya commemorates not only a religious event but also an early and far-reaching exchange of knowledge between two ancient civilisations.
How do Sri Lankan Buddhists observe Unduvap Poya?
Anuradhapura becomes the focal point of observance on Unduvap Poya day, with pilgrims travelling from across the island to pay homage at the Sri Maha Bodhi. The day typically involves:
- Offering flowers, oil lamps, and incense at the Sri Maha Bodhi and surrounding dagobas
- Observing the eight precepts (Sil), a more rigorous set of ethical commitments undertaken on Poya days
- Listening to Dhamma sermons (bana) at temples throughout the country
- Participating in meditation sessions and communal religious activities at local temples
- Visiting stupas and other sacred monuments within the Anuradhapura Sacred City
As with all Poya days in Sri Lanka, Unduvap is a national public holiday. Alcohol sales are restricted, and many businesses operate on a reduced schedule. Temples across the country hold special programmes from the early morning hours through to late evening.
What is the connection between Unduvap Poya and Adam's Peak?
Traditional accounts also link Unduvap to the Sri Pada pilgrimage at Sri Lanka's central highlands. It is recorded in Buddhist tradition that the Lord Buddha visited Sri Lanka on three occasions during his lifetime, and that on one such visit he placed his footprint on the summit of the mountain known as Adam's Peak (Sri Pada), at the invitation of the deity Sumana Saman.
The Sri Pada pilgrimage season, which begins around the Unduvap full moon each year and runs through Vesak in May, is one of the most physically demanding and spiritually significant journeys a Sri Lankan Buddhist undertakes. Pilgrims climb several thousand steps through forest and open terrain, often beginning before midnight to reach the summit by dawn. The ritual connection between Unduvap Poya and the opening of this pilgrimage season gives December an added layer of devotional significance for the country's Buddhist community.
Why is Unduvap Poya significant for women in Sri Lanka's Buddhist tradition?
Unduvap holds particular meaning for Buddhist women in Sri Lanka. The establishment of the Bhikkhuni Sasana by Sangamitta Theri gave women access to full ordination within the Theravada tradition, a development that had lasting consequences for gender and religious participation on the island. Contemporary Sri Lankan Buddhist women's organisations often mark Unduvap with programmes focused on the life and legacy of Sangamitta Theri, and the day is increasingly observed as a moment to reflect on the role of women in the island's long Buddhist history.
What should visitors expect when visiting Anuradhapura on Unduvap Poya?
Anuradhapura's Sacred City receives some of its largest crowds of the year on Unduvap Poya. Visitors should plan for significantly more foot traffic than on a regular day, particularly around the Sri Maha Bodhi enclosure and the nearby Ruwanwelisaya dagoba. Dress code is strictly observed — white clothing is customary for pilgrims, and all visitors are expected to remove footwear before entering sacred precincts.
The atmosphere is one of quiet reverence rather than festival spectacle. Incense, the sound of chanting, and the glow of thousands of oil lamps create a contemplative environment that many visitors find genuinely moving. For those travelling specifically to experience Unduvap Poya at Anuradhapura, accommodation in the city or nearby Tambuttegama should be secured well in advance, as availability tightens considerably in the days before the full moon.
