WebHaidian District (Chinese: 海淀区; pinyin: Hǎidiàn Qū) is an urban district of the city of Beijing.It is mostly situated in northwestern Beijing, but also to a lesser extent in the west, where it has borders with Xicheng and Fengtai.. It is 431 square km in area, making it the second-largest district in urban Beijing area (after Chaoyang), and is home to 3,133,469 inhabitants as of ...