The Andi Koysu ( - Andiyskoye Koysu, - 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 long or including its longest source river, Tushetis Alazani, and its drainage basin covers .Koysu in Great Soviet Encyclopedia At its confluence with the Avar Koysu, near the village Gimry in central Dagestan, it forms the river Sulak.
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