Altaussee (ˈalt.aʊ̯sˌseː; Central Bavarian: Oid Aussee) is a municipality and spa town in the district of Liezen in Styria, Austria. The small village is nestled on the shores of the Lake Altaussee, beneath the Loser Plateau. Occupying an area of 92 km2, Altaussee is home to 1,777 people. The municipality includes two cadastral communities: Altaussee and Lupitsch. The designated climatic spa is within the Salzkammergut region. Altaussee has the biggest salt deposits of Austria, which are still mined today. The municipality is located in the small Ausseerland-Region within the Styrian part of the Salzkammergut in the district of Liezen in Styria. Altaussee covers an area of 92.11 km 2 and is located at 712 m above sea level on the western shore of Lake Altaussee on the southwestern edge of the Totes Gebirge. The community center is located in a valley, which is encircled by mountains. The most noticeable of these peaks are the Loser (1838 m) to the north, the Trisselwand (1755 m) to the east and the Sandling (1717 m) to the west. The highest mountain within the community area is the Schoenberg (2093 m) close to the border with Upper Austria. Due to the alpine location and the strong share of the Totes Gebirge about half of the municipal area consists of alpine wasteland, the rest are forests, grasslands and other land forms. Nearby towns are Bad Aussee, Hallstatt, Bad Goisern, Bad Ischl and Gmunden. The characteristic pale grey mountains which surround Altaussee are made of limestone, a carbonate rock. The age of these rocks are Triassic and Jurassic. The mountains themselves did not form until the Cenozoic, when immense forces between the colliding African and Eurasian plates caused the mountains to be uplifted. The limestones which make up the mountains are white to pale grey in colour, and formed relatively deep in the ancient Tethys ocean. Because the rocks formed so deep, fossils are rare. However, corals are reported from the lower slopes of Loser mountain.