Xinjiang has an annual runoff of 88.4 billion cubic meters of the surface water and 25.2 billion cubic meters of exploitable underground water. Glaciers stretch for 24,000 square kilometers and contain 2,580 billion cubic meters of water. There is a long duration of sunshine and the annual sunshine time lasts from 2,600 to 3,400 hours. The predicted reserve of coal in Xinjiang makes up of 37.7 percent of the nation’s predicted total while that of petroleum and natural gas was estimated at 30 billion tons, accounting for more than 25 percent of the national  total.