Héyuán (Chinese: 河源) is a prefecture-level city of Guangdong province in the People's Republic of China. At the 2010 census, its population was 2,950,195 whom 903,871 lived in the built-up (or metro) area made of Yuancheng urban District and Dongyuan County largely being urbanized. Zijin County itself is quickly being conurbated in the agglomeration. The majority of the people are Hakka. The city includes many rainforests and the largest lake in Guangdong: Xinfengjiang Reservoir.