Łebsko Lake (Kashubian: Jezoro Łebsczo; Polish: Jezioro Łebsko) is a brackish coastal lake in the Pomeranian Voivodeship of Poland. It is connected to the Baltic Sea by the Łeba River, which causes saltwater intrusion. It is located within Słowiński National Park. The lake formed when sea winds pushed up a spit of sand that ultimately separated it from the Baltic sea. The town of Łeba sits where the Łeba river meets the sea.
Slovincian (Slovincian: slôvjinskjy, IPA: [slɵˈvjinskjɪ]; Polish: słowiński [swɔˈvij̃skʲi]; Kashubian: słowińsczi [swɔˈviɲst͡ɕi]; German: Slowinzisch) is an extinct language formerly spoken by the Slovincians living between lakes Gardno and Łebsko near Słupsk in Pomerania.
Slovincian is classified either as a language (first by Friedrich Lorentz), or as a Kashubian dialect or variant. Slovincian and Kashubian are both classified as Pomeranian. See below.