Which region does the Wuma River in Yichun belong to?

Wucui District.

According to the official website, Yichun Municipal People's Government, Wucui District, formerly known as Wumahe District, is a municipal district of Yichun City, Heilongjiang Province. It is located in the west of Yichun City and has a total length of 264 kilometers. Wumahe District (Bureau) is one of the administrative districts (bureaus) under the jurisdiction of Yichun City (Forest Management Bureau).