 Located about east of Gangtok, the capital of Sikkim, this sanctuary covers an area of about , and extends from the "15th Mile" police check point up to and along the ridges bordering the Rong Chu Valley and Lake Tsomgo.Rich in both flora and fauna, rare, endangered ground orchids and rhododendrons interspersed among tall junipers and taller silver firs are among the important plants present.