Panj (river)

The Panj () (; , پنج), also known as "Pyandzh" or "Pyanj" (derived from its Russian name "Пяндж"), is a tributary of the Amu Darya. The river is long and has a basin area of . It forms a considerable part of the Afghanistan–Tajikistan border.
The river is formed by the confluence of the Pamir River and the Wakhan River near the village of Qalʿa-ye Panja (Qalʽeh-ye Panjeh). From there, it flows westwards, forming the border of Afghanistan and Tajikistan. After passing the city of Khorugh, capital of the Gorno-Badakhshan Autonomous Region of Tajikistan it receives water from one of its main tributaries, the Bartang River. It then turns towards the southwest, before joining the river Vakhsh and forming the greatest river of Central Asia, the Amu Darya. Panj played an important role during Soviet times, and was a strategic river during the Soviet military operations in Afghanistan in the 1980s.
Water consumption.
A water treaty between the Soviet Union and Afghanistan, signed in 1946, allows Afghanistan to draw 9 million cubic metres of water a year. 
It currently draws 2 million cubic metres of water. According to the Panj River Basin Project environmental damage could be expected if Afghanistan drew the entire amount of water from the river that the treaty allows.
Bridges.
The Aga Khan Development Network has been engaged in a project to build a series of three bridges across the Panj River between Tajikistan and Afghanistan.