Parakrma Samudraya in Polonnaruwa

Parakrama Samudra (or King Parakrama's sea or the Sea of King Parakrama) is a shallow reservoir, consisting of five separate reservoirs(thopa, dumbutulu, erabadu,boo, katu tanks) connected by narrow channels in Polonnaruwa, Sri Lanka.

The northernmost reservoir is the oldest and referred to as Topa wewa (Sinhalese wewa = lake or reservoir) built around 386 AD. The middle section Eramudu wewa and the southernmost portion, at the highest elevation, is Dumbutula wewa, both sections were added and the reservoir expanded during the reign of King Parâkramabâhu