The Andi Koysu (Russian: Андийское Койсу - Andiyskoye Koysu, Georgian: ანდის ყოისუ - Andis Qoisu) is a river in Dagestan (Russia) and Georgia. It starts at the confluence of the rivers Pirikiti Alazani and Tushetis Alazani, near Omalo in the Tusheti region of Georgia. It is 144 kilometres (89 mi) long or 192 kilometres (119 mi) including its longest source river, Tushetis Alazani, and its drainage basin covers 4,810 square kilometres (1,860 sq mi).^[1] At its confluence with the Avar Koysu, near the village Gimry in central Dagestan, it forms the river Sulak.

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Andi Koysu
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Location
Countries	Georgia Russia
Physical characteristics
Source
• location	confluence of Pirikiti Alazani and Tushetis Alazani
• coordinates	42.3547°N 45.6585°E / 42.3547; 45.6585
Mouth
• location	Sulak
• coordinates	42.7906°N 46.7963°E / 42.7906; 46.7963
Length	144 km (89 mi)
Basin size	4,810 km2 (1,860 sq mi)
Basin features
Progression	Sulak→ Caspian Sea

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