Changu Lake (Tsongmo Lake)
This lake is located above 3750 meters height from sea level. It situated 40 kilometers distance from Gangtok. Gangtok is the capital of Sikkim. In the season of winter this lake covered with ice fully. For visiting this lake you need a special permit issued from tourism office of Gangtok. For enjoying Changu lake completely then you should need to ride on Yalk.
This pass is located at a distance of 18 kilometers from Changu lake. The height of this pass from sea level is 4200. Nathula pass is located between India and Tibbat.
At Nathula pass, you always seem cold season. Here always cold air blowing. So for avoiding cold sickness, you should need to not stay more than one hour.
This pass is located near the border of China country. So, here always both armies (Indian army and China army) carry on their duties.