However, the Dongkya range that normally runs in the north-south direction gently curves to east-west at the southern end of the Chumbi Valley, running through the Batang La and Sinchela passes and sloping down to the plain. A second ridge to the south, called the Zompelri or Jampheri ridge, runs parallel to the first ridge, separated by the Doklam or Doka La valley in the middle. At the top of the valley, the two ridges are joined, forming a plateau. The highest points of the plateau are on its western shoulder, between Batang La and Mount Gipmochi, and the plateau slopes down towards the southeast. A stream flows down the Doklam valley collecting the run-off water from the plateau, and joins the Amo Chu river about 15 km to the southeast.