Issyk-Kul Lake is one of the largest and deepest lakes in the world, located in the north-east of Kyrgyzstan in the Tien Shan mountains at an altitude of 1,600 meters. The length of the lake is 180 km, while its width is 30-60 km. The average depth of the lake is 300 meters, but in some places it reaches 700 meters. About 80 mountain rivers flow into Issyk-Kul, but none flows out. Issyk-Kul is a very beautiful non-freezing lake and is one of the cleanest and most transparent on the planet with the slightly salty sea water. It lies in the hollow between the two mountain ranges of Kungei Ala-Too in the north and Terskey Ala-Too in the south and creates a unique mountain-and-marine therapeutic microclimate. There is a large number of guest houses, resorts, and sanatoriums around the lake that attract lots of tourists. There are many gorges in the mountain ranges with beautiful high mountain peaks, glaciers, passes and lakes. There are many mixed coniferous and deciduous forests. There are many opportunities for developing interesting hiking trails for tourists and alpinists of any complexity and duration. The tourist tours around the lake with the visits to beautiful gorges around the lake are very popular among tourists. In winter, ski resorts open up, the most famous and popular of them being the ski base in Karakol.