Issyk-Kul Lake, or Ysyk-Köl in Kyrgyz, in the north-eastern Tian Shan is the largest lake in Kyrgyzstan and the second largest mountain lake in the world after Titicaca. The highest peaks are in the Kakshaal-Too range, forming the Chinese border. Peak Jengish Chokusu, at , is the highest point and is considered by geologists to be the northernmost peak over in the world. Heavy snowfall in winter leads to spring floods which often cause serious damage downstream. The runoff from the mountains is also used for hydro-electricity.