Emin County (Chinese: 额敏县) also known as Dörbiljin County (Uyghur: دۆربىلجىن ناھىيىسى; Kazakh: ءدوربىلجىن اۋدانى), is a county situated in the north of the Xinjiang Uyghur Autonomous Region and is under the administration of the Tacheng Prefecture, bordering Kazakhstan's districts of Tarbagatay and Zaysan. It has an area of 9,092 km² (3,510 sq mi) with a population of 200,000. The local postal code is 834600.

Geographically, the county is located on the southern slopes of the Tarbagatai Mountains and in the Emin Valley. The main watercourse is the Emin (Emil) River.

The place was originally named Dörbiljin. In 1918, Yang Zengxin, the governor of Xinjiang, petitioned to have a county set up in the Emin Valley. The new county was named after the Emin (Emil) River. Nevertheless, the official Kazakh and Uyghur name of the county is still "Dörbiljin".

The Karamay–Tacheng Railway (under construction as of 2017) will serve Emin County.

Emin County is divided into 6 towns, 3 townships, and 2 ethnic townships.

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