The Dongkya Range, also called Chola, occupies the three-way border with Bhutan, Sikkim, and Tibet, and reaches southward into West Bengal as the Singalila Ridge. Gipmochi is located on the trijunction point of Bhutan, Sikkim and Tibet. One of the range's spurs extends southward from Jomolhari on the northwest border, forming the watersheds between the Chumbi Valley Teesta, Torsa (Amo), and Raidāk (Wong) systems in all three countries.