Wudalianchi, formerly Dedu County, is a county-level city in Heilongjiang province, China. It is under the jurisdiction of the prefecture-level city of Heihe. It contains a volcanic field. The city's name means "five joint ponds" and refers to a set of interconnected lakes formed after the eruption of the volcanoes of Laoheishan (, means "Old Black Mountain") and Huoshaoshan (, means "Fire Burn Mountain") in 1720–21. The city is served by Wudalianchi Dedu Airport.

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