59°05′N 18°08′E / 59.08°N 18.14°E Berga Naval Base (Swedish: Berga örlogsbas) is a naval base of the Swedish Navy located in the Hårsfjärden fjard near Berga, Haninge Municipality. Today it is the home of the 4th Naval Warfare Flotilla, the 1st Marine Regiment and Home Guard unit Södertörn Group (Södertörnsgruppen).