| Astarachay | |
| Astaraçay, آستاراچای | |
| River | |
| Country | |
|---|---|
| Provinces | Gilan |
| District | Astara |
| Cities |
Astara |
| Mouth | Caspian Sea |
| Length | 38 km (24 mi) |
| Basin | 242 km2 (93 sq mi) |
Coordinates: 38°15′N 48°31′E / 38.25°N 48.52°E
The Astarachay (Persian: آستاراچای, Azerbaijani: Astaraçay), is a small river that defines the eastern border between Iran and Azerbaijan in Western Asia.
It is a tributary of the Caspian Sea. After flowing in a canyon through the Alborz mountain range, it reaches its river mouth on the southwestern Caspian coast.
It is partially in Gilan Province of far northwestern Iran.