Wikipedia
Guangzhouwan (officially Kouang-Tchéou-Wan; also spelled Kwangchow Wan, Kwangchow-wan, Kwang-Chou-Wan or Quang-Tchéou-Wan) was a small enclave on the southern coast of China ceded by Qing China to France as a leased territory and administered as an outlier of French Indochina. The territory did not experience the rapid growth in population that other parts of coastal China experienced, rising from 189,000 in 1911 to just 209,000 in 1935. Industries included shipping and coal mining.
Japan occupied the territory in February 1943. The French briefly took it back in 1945 before returning it to China in 1946, at which point it was given the name Zhanjiang, also known in Cantonese as Tsamkong. The capital of the territory was Fort-Bayard. The old spellings "Tsankiang", "Chankiang" and "Tsamkong" were replaced by the pinyin romanisation " Zhanjiang" by the Chinese government in 1958.