The hill is an oblong tableland, which measures about 400 by 250 metres, has an area of 7 hectares (17 acres) 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.