The Bumdeling Wildlife Sanctuary (also spelled Bumdelling or Bomdeling), which contains the former Kulong Chu Wildlife Sanctuary, covers 1,520.61 square kilometres (587.11 sq mi) in northeastern Bhutan at elevations between 1,500 metres (4,900 ft) and 6,000 metres (20,000 ft).

The sanctuary covers most of Trashiyangtse District, including Bumdeling Gewog.

It contains diverse flora, fauna, and scenery including alpine lakes and the Bumdeling Valley.

[3] The sanctuary has been identified as an Important Bird Area by BirdLife International because it supports black-necked cranes (it is one of the country's two wintering sites), wood snipes and grey-crowned prinias.

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