Zepu, also known as Poskam County, is a county located in the Kashgar Prefecture of the Xinjiang Uyghur Autonomous Region in China. It is situated on the southern bank of the Yarkand River, which is also referred to as the Zarafshān River.
The county is bordered by Yarkant County (Shache) to the north and west across the Yarkand River, while Kargilik County (Yecheng) lies to its south and east.