https://en.wikipedia.org/wiki/Wakhan
The eastern extremity of Upper Wakhan is known as the Pamir Knot, the area where the Himalayas, Tian Shan, Karakoram, Kunlun, and Hindu Kush ranges meet. West of the Pamir Knot is the Little Pamir, a broad U-shaped grassy valley 100 km long and 10 km wide, which contains Chaqmaqtin Lake, the headwaters of the Aksu or Murghab River.