Yanshan District (simplified Chinese: 燕山区; traditional Chinese: 燕山區; pinyin: Yànshān Qū) is a former district of Beijing, located southwest of the city center, and was situated in the middle of Fangshan. It spanned an area of 37.8 square kilometres (14.6 sq mi). It bordered Fangshan throughout on all four sides. It merged into the Fangshan in 1986.