North Sikkim is rich in Bio - Diversity with a large variety of flowers, plants & wild life. North Sikkim is best place for Mountain, flowers, and various spices, flora and fauna.Yumthang valley is famous for Its natural vegetation including Ordhids and rhododendron. Gurudongmar Lake is located at an altitude of 18,000 ft and is one of the highest lakes in the world. The lake is posited on the north of the Khanchenjunga Range. Being on so high altitudes, the water of the lake remains frozen from November to May.