|Native name||Qudyalçay (Azerbaijani)|
|• elevation||3,000 m (9,800 ft)|
|-30 m (98 ft)|
|Length||108 km (67 mi)|
|Basin size||799 km2 (308 sq mi)|
Qudyal starts at the northern slope of Tufan Dagh in Greater Caucasus, at 3,000 meters above sea level in Quba District. The river ends its stream by flowing into the Caspian sea through Khachmaz District.
The water from Qudyal is used for irrigation purposes and some of the water also flows into the Samur–Absheron channel.
The length of Qudyalchay is 108 km and the basin size is 799 km². Average annual water consumption is 6,85 cubic meters per second.
The river is mostly fed by snow (50%), groundwater (32%) and rain (18%). From April to July, the river floods due to melting of the snow and increase in water.