iuzhaigou has three valleys naturally formed in a Y shape. The Rize Valley 18km long and Zechawa Valley 17km long flow from the south and meet at a confluence where they form the Shuzheng valley 15km long in the middle, continuing to flow north to the mouth of the Shuzheng Valley. All the three valleys are accessible both by shuttle bus and boardwalks. There are 17 waterfall groups, 47 springs and 114 lakes in the national park.