Madoi County is a county of Golog Tibetan Autonomous Prefecture, in southeast-central Qinghai province, bordering Sichuan to the south. Its area is about 25,000 km2 (9,700 sq mi), and with an average elevation of 4,300 m (14,000 ft) it is the highest Chinese county by average elevation. In Madoi County is the upper stream of the Yellow River which flows to Ngoring and Gyaring lake.