The Yumthang Valley or Sikkim Valley of Flowers sanctuary, is a nature sanctuary with river, hot springs, yaks and grazing pasture on rolling meadows surrounded by the Himalayan mountains in Yumthang in the Mangan district of Sikkim state in India. It is approx. 75 km from Mangan town, the district headquarters. It is at an elevation of 3,564 metres a…The Yumthang Valley or Sikkim Valley of Flowers sanctuary, is a nature sanctuary with river, hot springs, yaks and grazing pasture on rolling meadows surrounded by the Himalayan mountains in Yumthang in the Mangan district of Sikkim state in India. It is approx. 75 km from Mangan town, the district headquarters. It is at an elevation of 3,564 metres above msl at a distance of 150 kilometres from the state capital Gangtok.