Ditch about 30 kilometers, Mizoguchi 1500 meters above sea level, the top groove white Xilongchi 4020 meters, groove width Department more than 300 meters, narrow only about 1 m Department.

• 沟长约30公里，沟口海拔1500米，沟顶的白龙池4020米，沟宽处300余米，窄处仅1米左右。