In 1945, East Prussia was dissolved, and the lands were distributed among Poland, Russia and Lithuania. As such, there is no single name that refers to the former province as a whole.
East Prussia was redistributed during the Potsdam Conference at the end of World War II. As a result of this conference, the then Soviet Union was given northern East Prussia, while Poland absorbed most of the southern lands. Most of the northern lands of East Prussia, including the former Konigsberg, are now part of the Kaliningrad Oblast of Russia. The remaining areas of northern East Prussia were annexed by Lithuania. Southern East Prussia was granted to Poland, allowing the country access to the Baltic Sea on its north border.