Bolshoy Irgiz
Location
Country	Russia
Oblasts	Samara Oblast and Saratov Oblast
Physical characteristics
Mouth	Volga
• location	Volgograd Reservoir near Balakovo
• coordinates	51°59′07″N 47°31′01″E / 51.98528°N 47.51694°E / 51.98528; 47.51694
Length	675 km (419 mi)
Basin size	24,000 km2 (9,300 sq mi)
Basin features
Progression	Volga→ Caspian Sea

The Bolshoy Irgiz (Russian: Большой Ирги́з, literally Great Irgiz) or Irgiz (Ирги́з) is a river in Samara and Saratov Oblast, Russia, a left tributary of the Volga, south of the Samara River. It is 675 km (419 mi) long and the area of its drainage basin is 24,000 km² (9,266 sq mi).^[1] Its headwaters are at the Obshchy Syrt adjoining the Ural River basin. It flows west and joins the Volga south of Samara. Irgiz's meandering riverbed passes the steppes. The river has snow feeding. The town of Pugachyov is located along the Irgiz. The river flows to the Volgograd Reservoir of the Volga downstream Balakovo, near Volsk.^{[citation needed]}