evidence: Doklam (Tibetan: འབྲོག་ལམ, Wylie: ‘brog lam, THL: drok lam),[1][a] called Donglang (Chinese: 洞朗) by China,[5][6] is an area in Chumbi Valley with a high plateau and a valley, lying between China's Yadong County to the north, Bhutan's Ha District to the east and India's Sikkim state to the west. Since the 1960s, China and Bhutan have disputed sovereignty over the Doklam area. The dispute has not been resolved despite several rounds of border negotiations between Bhutan and China.[3][7] The area is of strategic importance to all three countries.[3][8][9] [...] Anglo-Chinese Treaty [edit]China claims the Doklam area as Chinese territory based on the Anglo-Chinese Treaty of 1890, negotiated between the British Empire in India and the Chinese resident in Tibet.[86][87] Its purpose was to delineate the boundary between Sikkim and Tibet, and Bhutan was mentioned only in the offing. Article I of the treaty states: [...] On 29 June 2017, Bhutan protested the Chinese construction of a road in the disputed territory.[96] The Bhutanese border was put on high alert and border security was tightened as a result of the growing tensions.[97] On the same day, China released a map depicting Doklam as part of China, claiming, via the map, that all territory up to Gipmochi belonged to China by the 1890 Anglo-Chinese treaty.[98]