evidence: China's claim on Doklam is based on the 1890 Convention of Calcutta between China and Britain, which states in Article I:[15] [...] On the same day, China Foreign Ministry released a map depicting Doklam as part of China. Using the map as illustration, China's Spokesperson Lu Kang read Article I of the 1890 Convention of Calcutta and asserted that it proved that the Donglang (Doklam) area, a territory North East of Gipmochi as shown on the map, belongs to China.[26] [...] - ^ Joseph, Anil K.; Varma, K.J.M (8 August 2017). "Bhutan Acknowledges Doklam is Under Chinese Territory, Claims Top Chinese Official". thewire.in. Archived from the original on 25 August 2017.