Mentougou District (simplified Chinese: 门头沟区; traditional Chinese: 門頭溝區; pinyin: Méntóugōu Qū) is a district in western Beijing. Spanning 1,321 square kilometres (510 sq mi), with 266,591 inhabitants (2000 Census), it is subdivided into 4 subdistricts of the city proper of Beijing and 9 towns (1 of which is a suburb of the city proper of Beijing).