<P> The border between China and Nepal is 1,236 kilometres (768 mi) in length, along the mountain range the Himalayas, extends northwest - southeast direction, separating the south of Tibet Autonomous Region of China and the territory of Nepal . This border passes through the highest peak in the world, Mount Everest . </P> <P> The line extends between two tripoints China--Nepal--India . The tripoint in the west is in the Nepalese district of Mahakali Zone . The tripoint in the east is in the region of Mechi . </P> <P> Throughout history, Nepalis traded with the Tibetans via the many border crossing . One of the most important goods traded was salt from the Tibetan areas . </P>

Which two district of nepal border on both india and china