Polonnaruwa lake

Polonnaruwa Lake, also known as Parakrama Samudraya, is a massive man-made reservoir in Sri Lanka, built during the reign of King Parakramabahu I (1153–1186 AD) to support agriculture and water security. 

Spanning around 2,500 hectares, it was formed by connecting five smaller reservoirs and features a 14-kilometer-long embankment. 

This engineering marvel, still in use today, irrigates farmland, supports fishing, and attracts wildlife, making it a vital resource and a popular historical site in Polonnaruwa.