Deeghawapi (Pali, "long reservoir") is a Buddhist sacred shrine and an archaeological site in the Ampara District of Sri Lanka, boasting of historical records dating back to the 3rd century BCE.

Water reservoirs, called "tanks", were an important feature of the hydraulic civilization of ancient Sri Lanka, and temples and cities were built around them.

The importance of Dighavapi is connected with legends about visits to this site by the Buddha himself, and many allusions to Deeghawapi in the ancient chronicles as well as in the Pali literature.

[2] The Mahavamsa, an ancient chronicle written in the 5th century, and the Dipavamsa of an earlier date, contain a mixture of legend and historical facts.

Other sites in this area have been discussed recently by the archeological researches of several workers including E. Medhananda[7] More detailed historical and lithographic records are available for the history of this region as a part of the Ruhuna kingdom, during the time of King Kavan-Tissa, the father of Dutugemunu.

After the re-conquest of the Pihiti rata (approximately today's Northern province), Tissa was again in charge of Dighavapi, for we find him being sent for from there at the time of Dutugamunu's death (Mhv.xxxii.2)).

By 1640 CE the Dutch won over Trincomalee (Gokanna) and Batticaloa (Madakalapuva) from the Portuguese but subsequently refused to hand over the littoral to Sinhala Rule, claiming compensation for military expenses.

In 2021, former President Gotabaya Rajapaksa initiated the ‘Deeghawapi Trust Fund’ which aims to rebuild the stupa and reconstruct the ancient premises.