The Rehe reference article from the English Wikipedia on 24-Jul-2004
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Rehe

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Rehe (热河 or 熱河 pinyin: re4 he2, lit. hot river), also known as Jehol, is a defunct Chinese province that used to consist of part of today Hebei Province, Shanxi Province and Inner Mongolia.

From January 21, 1933 to August 15, 1945, it was a part of Manchukuo. Its capital was Chengde (承德 cheng2 de2).