Pyandzh

Pyandzh is a river in Central Asia, forming a significant portion of the border between Tajikistan and Afghanistan. It is formed by the confluence of the Pamir River and the Wakhan River in the Pamir Mountains. The Pyandzh flows westward, then northwest, and is a major tributary of the Amu Darya river. The river is approximately 921 kilometers (572 miles) long.

The Pyandzh river basin is characterized by high mountain ranges, deep valleys, and arid plateaus. The river's flow is primarily fed by snowmelt and glaciers from the Pamir Mountains, leading to significant seasonal variations in water levels. Irrigation is crucial for agriculture in the surrounding regions, and the Pyandzh plays a vital role in supplying water for this purpose.

The river's course is marked by rapids and waterfalls in its upper reaches, becoming wider and slower as it progresses downstream. Its waters are used for hydroelectric power generation, with several dams located along its course. The Pyandzh also supports a diverse range of flora and fauna adapted to its mountainous and arid environment. The river is an important transportation route in some sections, though its navigability is limited by its turbulent nature in many areas.