Analysis of information sources in references of the Wikipedia article "Wakhan Corridor" in English language version.
The Sino-Afghan border was delimited in a secret treaty signed during November 1963. The corridor shares a border with Pakistan to its south and Tajikistan to its north.
In addition, the Soviet Union is separated from Pakistani territory by a small strip commonly known as the Wakhan corridor. Theoretically the Soviet Union does not have a common border with Pakistan but in view of their close linkage with Afghanistan and the shortness of Wakhan's breadth make it an immediate neighbour for all practical purposes.
The Chitral and Kalash valleys of the Hindu Kush Mountains are located north of the Swat Valley in the Chitral district of the North-West Frontier Province and are bordered by Afghanistan on the north, south, and west. The Wakhan Corridor separates Pakistan from Tajikistan. The corridor, wedged between the Pamir Mountains to the north and the Karakoram range to the south, is about 350 km (220 mi) long and 13–65 kilometres (8–40 mi) wide.
