Also called the Bavarian sea, Chiemsee is a freshwater pre-alpine lake in Bavaria, Germany, and like other pre-alpine lakes, it was formed about 10000 years ago from a hollow carved out by a glacier. It is situated between Rosenhein, Germany and Salzburg, Austria. The lake has two rivers flowing into it: Tiroler Achen and Prien; and river Alz is flowing out of it. The north part of the lake, the biggest section of the lake, is called Weitsee, while the southwestern part, the smaller part, is called the Inselsee. The lake is situated in a very famous recreation area of Chiemgau.