The Curonian Lagoon (or Bay, Gulf; Russian:Куршский залив, Lithuanian:Kuršių marios, Polish:Zalew Kuroński, German:Kurisches Haff) is separated from the Baltic Sea by the Curonian Spit. Its surface area is 1,619 square kilometers (625sqmi). The Neman River supplies about 90% of its inflows; its watershed consists of about 100,450 square kilometres in Lithuania and Russia's Kaliningrad Oblast.