Chiemsee 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, and the river Alz flows 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.

Bavaria, officially the Free State of Bavaria, is a state in the southeast of Germany. With an area of 70,550.19 km2 (27,239.58 sq mi), it is the largest German state by land area, comprising roughly a fifth of the total land area of Germany. With over 13 million inhabitants, it is the second most populous German state behind North Rhine-Westphalia, but due to its large physical size its population density is below the German average. Major cities include Munich, Nuremberg, and Augsburg.