At 84.5 kilometers, it is the longest river in the province of Ourense.

The Spanish wine denominación de origen protegida of Ribeiro DOP is located at the confluences of the valleys formed by the rivers Miño, Avia, and Arnoia.

According to E. Bascuas, the toponym "Arnoia" would be derived from the Paleo-European base * Ar-n-, derived from the Indo-European root * er- 'flow, move', with hydronymic significance.

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