Abhaya Wewa (Sinhalese: අභය වැව), historically Abhayavapi (Sinhalese: අභයවාපි) or Bassawakkulama reservoir, is a reservoir in Sri Lanka, built by King Pandukabhaya who ruled in Anuradhapura from 437 BC to 367 BC, after constructing the city.

[5] Area is 1,235 acres (500 ha; 1.930 sq mi); the 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).

[1][2] Built inside the ancient Anuradhapura, it supplied water to the city population.

The reservoir was called Abaya Vapi at that time, in memory of one of King's uncles.

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