Tungkyong Dho (Lake) is believed to be one of the oldest natural dho (lake) directly related to the Hee-Youngmingmoo clan of Lepcha community in Dzongu. Dzongu valley is a specially protected area for aboriginal/ indigenous primitive tribes considered to be the original inhabitant of Sikkim called as Lepchas and a very unique cultural and historical significance. The Lepchas, as in other communities have their own share of clan or caste and are nature worshipper and custodians since time immemorial. The Lepchas sanctify this sacred lake yearly through ‘MUN PUDIM’ and through lama also.
The area harbours considerable number of plant species including Acer oblongum, Albizia sp, Alnus nepalensis, Bischofia javanica, Castanopsis tribuloides, Cryptomeria japonica, Duabanga grandiflora, Juglans regia, Macaranga pustulata, and Schima wallichii. Some of the mammals found in the area are Asia black bear, rhesus monkey, porcupine, palm civet, flying squirrel, barking deer, goral, squirrel, yellow-throated marten, jackal, jungle cat, otter, wild-boar, pangolin, etc.
It also harbour numerous bird species like like black bulbul, black drongo, great barbet, grey treepie, chestnut crowned laughing thrush, common kestrel, blue whistling thrush, serpent eagle, long-tailored minivet, oriental magpie, oriental turtle dove, white crested laughing thrush, etc.
