Slapy Reservoir (Czech: Vodní nádrž Slapy) is dam on the Vltava river in the Czech Republic, near to village Slapy. By area 11.626 square kilometres (4.489 sq mi), it is the sixth biggest dam in the country. It was built as part of Vltava cascade between years 1949 and 1955. It has a hydroeletrics power station included. It is located approximately 30 kilometres (19 mi) from capital city Prague, so it is used for recreation too.