High Quality Content by WIKIPEDIA articles! Yumthang Valley is a grazing pasture surrounded by the Himalayan mountains in the North Sikkim district of Sikkim, India. It is at an elevation of 3,575 metres (14,000) above msl at a distance of 150 km from the state capital Gangtok. It is also home to the Shingba Rhododendron Sanctuary, and has over twenty-four species of the rhododendron, the state flower. A tributary of the river Teesta flows past the valley and the town of Lachung, the nearest inhabited centre. Yumthang is closed between December and March due to heavy snowfall.