Curonian Lagoon
Klaipėda County borders Kaliningrad Oblast, Russia, to the south via the Nemunas, which drains into the Curonian Lagoon. The Curonian Spit, a UNESCO World Heritage Site, is split between Klaipėda County, Lithuania and Kaliningrad Oblast, Russia. The Lithuanian side of the spit is separated from mainland Lithuania via a small opening between Klaipėda and Smiltynė where the Curonian Lagoon drains into the Baltic Sea.