Definition of "Haidian"

We woke up this morning to find ourselves in Communist territory. Advance Red units pushed past Yenching last night and occupied Haitien, the village just south of us on the road to Peiping.]

, Samuel Moffett, “Behind the Curtain: Reds Occupy Yenching”, in Presbyterian Life‎, volume 2, number 3, page 14, column 3

Six new cases were found in Beijing's central districts of Chaoyang and Haidian. China is seeing a spike in cases due to domestic travel in the past month.

2021 November 11, “Coronavirus digest: Germany reports new record-high case numbers”, in Deutsche Welle‎, archived from the original on 12 November 2021‎

When a column of smoke appeared on Thursday over the Sitong Bridge overpass in the Haidian district of Beijing, it drew attention to a protester who had hung banners openly bashing China’s top leader by name and criticizing the country’s “zero Covid” policy, including one calling for “freedom and not lockdowns.” […] Chinese censors have restricted searches about the episode on Weibo, China’s equivalent of Twitter, blocking certain hashtags, including “Beijing,” “Sitong Bridge” and “Haidian.”

2022 October 14, Daisuke Wakabayashi, Claire Fu, “China’s Internet Censors Race to Quell Beijing Protest Chatter”, in The New York Times‎, archived from the original on 14 October 2022, Asia Pacific‎