Juntan Reservoir (), also known as Jiuxian Lake (), is a vast reservoir in Guangfeng District of Shangrao, Jiangxi, China. It is one of the largest man-made lakes in Shangrao city.

It covers a total surface area of and has a storage capacity of some of water.

Function The reservoir provides drinking water, hydroelectric power and water for irrigation and recreational activities.

Dam The dam is a gravity dam high, long, and thick.

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