Longquan is a county-level city in Zhejiang Province, China, administered by the prefecture-level city of Lishui. It lies in the southwestern part of the province, on the upper reaches of the Ou River, and borders Fujian province to the southwest. It was formerly a county before being upgraded to city status.
The city sits in a mountainous part of southwestern Zhejiang, near the provincial boundary with Fujian. Its position on the upper Ou River places it within the river's drainage in this corner of the province.