Curonian Spit
The Curonian (Courish) Spit  is a 98-kilometre (61 miles) long, thin, curved sand-dune spit that separates the Curonian Lagoon from the Baltic Sea. Its southern portion is in  Kaliningrad Oblast, Russia. The northern part is in Klaipėda County, Lithuania. It is a UNESCO World Heritage Site shared by Lithuania and Russia.