East PrussiaEast Prussia (Ostpreußen) was a province of the Kingdom of Prussia from 1773 to 1829 and again from 1878 (with the Kingdom itself being part of the German Empire from 1871); following World War I it formed part of the Weimar Republic's Free State of Prussia, until 1945. Its capital city was Königsberg (present-day Kaliningrad). East Prussia was the main part of the region of Prussia along the southeastern Baltic Coast. The bulk of the ancestral lands of the Baltic Old Prussians were enclosed within East Prussia.
Curonian LagoonThe Curonian Lagoon (or Bay, Gulf; Prussian: Kursjanmari, Kuršių marios, Kuršu joma, Куршский залив, Zalew Kuroński, Kurisches Haff) is a freshwater lagoon separated from the Baltic Sea by the Curonian Spit. Its surface area is . The Neman River (Nemunas) supplies about 90% of its inflows; its watershed consists of about 100,450 square kilometres in Lithuania and Russia's Kaliningrad Oblast. In the 13th century, the area around the lagoon was part of the ancestral lands of the Curonians and Old Prussians.
Curonian SpitThe Curonian (Courish) Spit (Kuršių nerija; Ку́ршская коса́; Kurische Nehrung; Kuršu kāpas) is a long, thin, curved sand-dune spit that separates the Curonian Lagoon from the Baltic Sea. Its southern portion lies within Kaliningrad Oblast, Russia, and its northern within southwestern Klaipėda County, Lithuania. It is a UNESCO World Heritage Site shared by Lithuania and Russia. The Curonian Spit stretches from the Sambia Peninsula on the south to its northern tip next to a narrow strait, across which is the port city of Klaipėda on the mainland of Lithuania.
Kaliningrad OblastKaliningrad Oblast (Калининградская область) is the westernmost federal subject of the Russian Federation. It is a semi-exclave situated on the Baltic Sea. The largest city and administrative centre of the province (oblast) is the city of Kaliningrad, formerly known as Königsberg. The port city of Baltiysk is Russia's only port on the Baltic Sea that remains ice-free in winter. Kaliningrad Oblast had a population of roughly 1 million in the Russian Census of 2021.
