Oka (Angara)

Oka
Mouth location in Irkutsk Oblast, Russia
Location
Country	Russia
Physical characteristics
Source
• location	Oka Plateau, Sayan Mountains
Mouth	Angara
• location	Bratsk Reservoir
• coordinates	55°30′55″N 102°20′54″E / 55.51528°N 102.34833°E / 55.51528; 102.34833
Length	630 km (390 mi)
Basin size	34,000 km2 (13,000 sq mi)
Basin features
Progression	Angara→ Yenisey→ Kara Sea

The Oka (Russian: Ока, Buryat: Аха, romanized: Akha) is a river in Siberia, left tributary of the Angara. It is 630 kilometres (390 mi) long, and has a drainage basin of 34,000 square kilometres (13,000 sq mi).^[1]