A river of northwest China, eastern Kazakhstan, and central Russia flowing about 4,264 km (2,650 mi) generally northwest to the Ob River. It is navigable for much of its course.

• 额尔济斯河：流经中国西北部，哈萨克斯坦东部和俄罗斯中部一河，流程4,264公里(2,650英里），向西北流入鄂毕河。大部分河道可供航行