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; 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.
The Chiemsee was formed, like many other pre-alpine lakes, at the end of the last ice age about 10,000 years ago from a hollow carved out by a glacier . Originally the lake covered an area of almost 240 km², which is about three times its present area. Within 10,000 years its area shrank to around 80 km². Before 1904 the water level was lowered by about a metre. As a result, large areas of dry land were reclaimed.
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