Angeln is a peninsula on the eastern coast of Jutland, in the Bay of Kiel. It forms part of Southern Schleswig, the northernmost region of Germany. The peninsula is bounded on the north by the Flensburg Firth, which separates it from Sundeved and the island of Als in Denmark, and on the south by the Schlei, which separates it from Schwansen. The landscape is hilly, dotted with numerous lakes. The largest towns are Flensburg, Schleswig and Kappeln.