Toompea (from , "Cathedral Hill") is a limestone hill in the central part of the city of Tallinn, the capital of Estonia. The hill is an oblong tableland, which measures about 400 by 250 metres, has an area of and is about 20–30 metres higher than the surrounding areas. In folklore the hill is known as the tumulus mound over the grave of Kalev, erected in his memory by his grieving wife. The history of Toompea is closely linked to the history of rulers and power in Estonia. Today Toompea is the center of the Government of Estonia and the Riigikogu (parliament), both of which are often simply referred to as Toompea. The location of the Riigikogu is the Toompea Castle, situated in the southwestern corner of the hill and topped by the Tall Hermann tower. The flag on the top of the tower is one of the best-known symbols in Estonia of the government in force. Toompea is part of the Tallinn Old Town UNESCO World Heritage Site. Geology and topography Geologically Toompea is associated with the North Estonian Klint (itself a subsection of the Baltic Klint). A separate relic klint island, Toompea lies about 1.5 km northwest of the North Estonian Limestone Plateau. The plateau and Toompea are connected with a gently sloped sandstone ridge. From the east, north and west Toompea is bordered for 1.5 km by a cliff with a height of up to 25 m. The southern slope of the hill descends more gently. The upper layer of the hill consists of Ordovician limestone (thickness about 5 m), which is also the main rock exposed at the cliff. However, most of the cliff face has been hidden behind a protective wall and only a few outcrops are left. Toompea first emerged as an island from the Baltic Ice Lake around 10,000 years ago. Due to steady post-glacial rebound it became connected with the mainland during the early Littorina Sea stage. At 5,000 BCE the sea still reached the foot of the cliffs of Toompea. The modern coastline is at a distance of more than 1 km from Toompea and the foot of the hill lies at 17–20 m above sea level. The hill reaches about in elevation. Mythology In Estonian mythology Toompea is known as the tumulus mound over the grave of Kalev, erected in his memory by his grieving wife Linda, as described in