The Curonian (Courish) Spit (Lithuanian: Kuršių nerija; Russian: Ку́ршская коса́; German: Kurische Nehrung; Latvian: Kuršu kāpas) is a 98-kilometre (61 mi) long, thin, curved sand-dune spit that separates the Curonian Lagoon from the Baltic Sea. It is a UNESCO World Heritage Site shared by Lithuania and Russia. Its southern portion lies within Kaliningrad Oblast of Russia, and its northern within southwestern Klaipėda County of Lithuania.