, or Donglang
, is an area with a plateau and a valley, lying between China's Chumbi Valley to the north, Bhutan's Ha Valley to the east and India's Sikkim state's Nathang Valley to the west. It has been depicted as part of Bhutan in the Bhutanese maps since 1961, but it is also claimed by China. To date, the dispute has not been resolved despite several rounds of border negotiations between Bhutan and China. The area is of strategic importance to all three countries.