Chiemsee (German pronunciation:[ˈkiːmzeː]) is a freshwater lake in Bavaria, Germany, near Rosenheim. It is often called the Bavarian Sea. The rivers Tiroler Achen and Prien flow into the lake from the South; the river Alz, out towards the north. The Alz flows into the Inn which then merges with the Danube. The Chiemsee is divided into the bigger, north section, in the northeast, called Weitsee, and the Inselsee, in the southwest.