Unduvap Full Moon Poya commemorates the arrival of Arahat Sanghamitta Theri in Sri Lanka with the sacred Bodhi tree sapling from Bodh Gaya and the establishment of the Bhikkhuni Sangha. The Sri Maha Bodhi, planted in Anuradhapura in 288 BCE, still stands today as the world’s oldest recorded tree, symbolizing Sri Lanka’s enduring Buddhist heritage and the recognition of women in the monastic community.