| 1,235 acres (500 ha; 1.930 sq mi)|
133×10^ cu ft (3.8×10^ m)
Abhayavapi (Sinhalese: අභයවාපි) or commonly Abhaya Wewa (Sinhalese: අභය වැව) is a reservoir built by King Pandukabhaya who ruled in Anuradhapura from 437 BC to 367 BC, after constructing the city. This is now popularly known as Basawakkulama (Sinhalese: බසවක්කුලම) tank which is not the original name.
Area is 1,235 acres (500 ha; 1.930 sq mi); length of the Waw Kandiya (Sinhalese: වැව් කන්ඩිය English: embankment) is 5,910 feet (1.119 mi) and height is 22 feet (6.7 m). Width of the top of the embankment is 6 feet (1.8 m) to 8 feet (2.4 m).
Built inside the ancient Anuradhapura, it supplied water to then city population.