| Panj | |
|---|---|
The Panj river forms much of the border between Tajikistan and Afghanistan | |
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| Location | |
| Countries | Afghanistan and Tajikistan |
| Physical characteristics | |
| Source | |
| • location | confluence of Pamir and Wakhan rivers |
| Mouth | Amu Darya |
• coordinates | 37°06′39″N 68°18′53″E / 37.11083°N 68.31472°E |
| Length | 921 km (572 mi) |
Basin size | 114,000 km2 (44,000 sq mi) |
| Discharge | |
| • average | 1,000 m3/s (35,315 cu ft/s) |
| Basin features | |
| Progression | Amu Darya→ Aral Sea |
Official name | Lower part of Pyandj River |
| Designated | 18 July 2001 |
| Reference no. | 1084 |

The Panj, traditionally known as the Ochus River, is a river in Afghanistan and Tajikistan and a tributary of the Amu Darya. The river is 921 km (572 mi) long and has a basin area of 114,000 km2 (44,000 mi2). 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 Qala-i-Panjah in the Wakhan District of Badakhshan Province in Afghanistan. From there, it flows westwards and marks part of the Afghanistan–Tajikistan border. After passing the city of Khorog, 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 Vakhsh River and forming the greatest river of Central Asia, the Amu Darya. The Panj played an important role during Soviet era, and was a strategic river during the Soviet military operations in Afghanistan in the 1980s.


A water treaty between the Soviet Union and Afghanistan was signed in 1946, allows Afghanistan to draw 9 million cubic metres of water a year from the Panj. It currently draws only 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 allocated water from the river under the treaty.
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.