Tuen Mun District is one of the 18 administrative districts of Hong Kong. Its name was previously 'Tsing Shan' and it changed in the 1970s. It is the westernmost continental district of Hong Kong, located about 32 km from the Kowloon Peninsula, 7 km southwest of Yuen Long and 18 km west of Tsuen Wan. It had a population of 488,831 in 2001. Part of the district is the Tuen Mun New Town, which contains one of the largest residential areas in the New Territories.