Mustamäe (Estonian for Black Hill) is one of the 8 administrative districts (Estonian: linnaosa) of Tallinn, the capital of Estonia. The smallest by area (it covers only 8.1 km²), it is at the same time the second largest district by population with 66,305 inhabitants (As of 1 November 2014).It is located 5 km from the centre of Tallinn and is bordered by districts Haabersti, Nõmme, and Kristiine.