evidence: Himachal Pradesh – Kaurik & Shipki La, an ancient trade routem, Uttarakhand – Pulam Sumda & Barahoti Plains; Sikkim -: North Sikkim, a high-altitude snowbound plain area & Chumbi Valley, India–China–Bhutan tri-junction where Doklam is located and Arunachal Pradesh – Namkha Chu, Sumdorong Chu, Asaphila, Longju, Dichu, Yangtse, Fish Tail-1 & 2 in Dibang Valley and Lamang.