Wudalianchi (Chinese: 五大连池; pinyin: Wǔdàliánchí), formerly Dedu County (德都县), is a county-level city in Heilongjiang province, Northeast China, under the jurisdiction of the prefecture-level city of Heihe.

The city's name literal means "five great joint ponds", referring to a set of interconnected volcanogenic lakes formed after the eruption of the Laoheishan (老黑山, means "Old Black Mountain") and Huoshaoshan (火烧山, means "Fire Burn Mountain") volcanoes in 1720–21.

[1][2] The city's territory incorporates part of a volcanic field, which contains a APGN- and UNESCO-listed geopark.

Wudalianchi City is divided into 1 subdistrict, 7 towns and 4 townships.

[4] Media related to Wudalianchi at Wikimedia Commons 2 Formally part of Oroqen Banner in Inner Mongolia but administered de facto by Daxing'anling Prefecture in Heilongjiang.