Pangolakha Wildlife Sanctuary (Pron: pǽngólɑ́kha, Nepali: पाङ्लखा) is a wildlife reserve in the Pakyong District of the state of Sikkim in India. It is about east of Rorathang and about by road from Rangpo city. The total notified area of the park is around while inside the wildlife sanctuary there are a few hamlets: Aritar, Dakline Lingtam, Phadamchen, Dzuluk, Gnathang Monastery Kupup. This wildlife sanctuary is linked to the forests of Neora Valley National Park of West Bengal as well as forests of Samtse, Bhutan and Haa district Bhutan. The area that comes under this biosphere has been declared in 1999 as a wildlife sanctuary under biogeographic province category 2C. Geography Altitudinal range of the sanctuary lies between . Pangolakha range in the east separates Sikkim from its eastern neighboring country Bhutan, whereas it is linked through forest patches to the south with Neora Valley National Park in West Bengal. Some high altitude lakes are present there, including Lake Tsongmo, which act as a biodiversity hotspot for migratory birds. Rivers and their tributaries from the north are frozen from December to March; whereas they all flow with an enormous volume of water during the rainy season from mid-April to mid-October. Rangpo River and Jaldhaka River are the major rivers originating from the nearby lakes, which occur in this sanctuary. Biodiversity This wildlife sanctuary supports a large variety of species, since it falls at the junction of the Palearctic realm and the Indomalayan realm. As a Biogeographic Province, this wildlife sanctuary comes under 2C category. Ecoregions and biomes Inside this wildlife sanctuary, the primary ecoregions and their corresponding biomes are: Terai-Duar savanna and grasslands of the tropical and subtropical grasslands, savannas, and shrublands biome, Eastern Himalayan broadleaf forests of the tropical and subtropical moist broadleaf forests biome, Himalayan subtropical pine forests of the tropical and subtropical coniferous forests biome, Eastern Himalayan subalpine conifer forests of the temperate coniferous forests biome, and Eastern Himalayan alpine shrub and meadows of the montane grasslands and shrublands biome All of these are typical of the Bhutan - Nepal - India hilly region. Fauna Birds in Pangolakha Wildlife Sanctuary include kalij pheasant, Oriental honey buzzard, blood pheasant, white-crested laughingthrush, striated laughingthrush, chestnut-crowned laughingthrush, bar-throated minla, red-tailed minla, white-browed shrike babbler, white-browed fulvetta, rufous sibia, whiskered yuhina, stripe-throated yuhina, rufous-vented yuhina, brown dipper, rusty-flanked treecreeper, dark-rumped rosefinch, little bunting. It is also home for some rarities like