Parakrama Samudra

Parakrama Samudra is a shallow reservoir, consisting of five separate wewa connected by narrow channels in Polonnaruwa, Sri Lanka.
The northernmost reservoir is the oldest and referred to as Topa wewa 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 I. This wewa was built under the quote "do not let even a drop of rainwater in this country to go to the sea without use". The wewa was so large it was called Samudhraya which means "the ocean".