Memelland
After World War I ended in 1918, the Klaipėda Region was defined as a roughly triangular wedge, with the northern border being the Treaty of Melno border, the southern border following the Neman River, and on the west abutting the Baltic Sea. In 1923, fearing that the western powers would create a free state, Lithuanians took control of the region and, as part of larger regional negotiations, incorporated the region into the State of Lithuania. In March 1939 Lithuania acquiesced to Nazi demands and transferred the Klaipėda Region to Germany. As World War II came to an end in 1945, the Soviet Union incorporated the region into the Lithuanian SSR. Since 1990 the area of the Klaipėda Region has formed part of the independent Republic of Lithuania, as part of Klaipėda and Tauragė counties. The southern border established by the Treaty of Versailles defines the current international boundary between Lithuania and the Kaliningrad Oblast of the Russian Federation.