Tallinn is situated on the southern coast of the Gulf of Finland, in north central Estonia. The largest lake in Tallinn is Lake Ülemiste (covers 9.6 km²). It is the main source of the city's drinking water. Lake Harku is the second largest lake within the borders of Tallinn and its area is 1.6 km². Unlike many other large towns, the only significant river in Tallinn is located in Pirita (a city district counted as a suburb). The river valley is a protected area because of its natural beauty. A limestone cliff runs through the city. It is exposed, for instance, at Toompea and Lasnamäe. However, Toompea is not a part of the cliff, but a separate hill. The highest point of Tallinn, at 64 meters above the sea level, is situated in the district of Nõmme, in the south-west of the city. The length of the coastline is 46 kilometres. It comprises 3 bigger peninsulas: Kopli peninsula, Paljassaare peninsula and Kakumäe peninsula.
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