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Sviyaga
Sviyaga
	Sviyaga River at Ulyanovsk
Location
Country	Russia
Physical characteristics
Source
• location	Ulyanovsk Oblast
• elevation	100 m (330 ft)
Mouth	Volga
• location	Kuybyshev Reservoir
• coordinates	55°43′52″N 48°36′57″E / 55.73111°N 48.61583°E
• elevation	53 m (174 ft)
Length	375 km (233 mi)
Basin size	16,700 km2 (6,400 sq mi)
Discharge
• average	1,590 m3/s (56,000 cu ft/s) (near mouth)
Basin features
Progression	Volga→ Caspian Sea

The Sviyaga (Russian: Свияга; Tatar: Зөя; Chuvash: Сĕве, Sĕve) is a river in the Ulyanovsk Oblast and Tatarstan, a right tributary of the Volga.^[1] It is 375 kilometres (233 mi) long, and its drainage basin covers 16,700 square kilometres (6,400 sq mi).^[2] The Sviyaga flows into the Sviyaga Cove of the Kuybyshev Reservoir, west of Kazan. It freezes up in November or December and stays icebound until April or May. Major tributaries are the Arya, Birlya, Bula, Karla, Kubnya, Sulitsa and Tosha rivers.

The city of Ulyanovsk is along the Sviyaga. In Ulyanovsk, the Sviyaga flows only a few kilometres away from the Volga, but their eventual confluence happens much further downstream, about 200 kilometres (120 mi) north of Ulyanovsk.

The castle of Sviyazhsk, which dates to 1551, is on the island in Sviyaga Cove of the Kuybyshev Reservoir.