The existence of the ridge results in one of the great bends of the Yellow River. The river first flows for several hundreds of kilometers toward the east and southeast, along the south-western side of the Amne Machin Range. In so doing it crosses the entire length of Golog Prefecture, and reaches the borders of Gansu and Sichuan. Then the river turns almost 180 degrees to the left, passing to the northeastern side of the Amne Machin, and flows toward the northwest for 200–300 km through several prefectures of the northeastern Qinghai.