Balga (Russian: замок Бальга; German: Burg Balga; Lithuanian: Balga; Polish: Balga)[1] was a medieval castle of the Teutonic Knights in Kaliningrad Oblast, Russia. The castle ruins are located on the shore of the Vistula Lagoon, north of Mamonovo in the Pogranichny municipality of Bagrationovsky District, about 30 km (19 mi) southwest of Kaliningrad.