Baltiysk, prior to 1946 known by its German name Pillau, is a seaport town and the administrative center of Baltiysky District in Kaliningrad Oblast, Russia, located on the northern part of the Vistula Spit, on the shore of the Strait of Baltiysk separating the Vistula Lagoon from the Gdansk Bay. Baltiysk is the westernmost town of Russia.