Kyrgyzstan is a landlocked country in Central Asia, bordering Kazakhstan, China, Tajikistan and Uzbekistan. The mountainous region of the Tien Shan covers over 80% of the country, that with the remainder made up of valleys and basins can be called for "the Switzerland of Central Asia". Lake Issyk - Kul in the north-western Tian Shan is the largest lake in Kyrgyzstan and the second largest mountain lake in the world after Titicaca. The principal river is the Naryn, flowing west through the Fergana Valley into Uzbekistan. Bishkek in the north is the capital and largest city. The second city is the ancient town of Osh, located in the Fergana Valley near the border with Uzbekistan.