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The Évançon (sometimes written Évençon) is the stream which flows through the val d'Ayas and flows into the Doire baltée. Its name in Franco-Provençal might mean "Grand River" or "River from the Mountaintops" (eva d'en som). In archival documents it is often referred to as l'eau blanche ( French for "Whitewater").

The Unité des communes valdôtaines de l'Évançon takes its name from the stream.