Located in the shore of Mahaweli reservoir, this Stupa is the second largest Stupa in Sri Lanka, after Ruwanweli Maha Seya in Anuradhapura. 289 feet in hight and 628 feet in diameter, the Stupa can be accessed nearly by 4000 devotees at once. It has been constructed in commemoration of the temples, Devalayas and villages that have been submerged due to the Mahaweli Development project. Construction of this Stupa was an idea proposed by the former minister of the Mahaweli Development project, Gamini Dissanayake.
This is the first Temple Stupa having a small Stupa constructed inside of it. The devotees can enter to the stupa and witness the small stupa inside of it. Construction work has been started in 1983 and Vidya Jyothi Dr.A.N.S Kulasinghe is the main designer. After thirty three years of its initial construction, the stupa was opened by the President Maitripala Sirisena and the Prime Minister Ranil Wickamasinghe on 20th June 2016.