The river Eaulne (French pronunciation: [o(l)n]) is one of the rivers that flow from the plateau of the eastern Pays de Caux in the Seine-Maritime département of Normandy in northern France.

[1] The Eaulne's source is at Mortemer.

It then flows northwestwards through Sainte-Beuve-en-Rivière, Saint-Germain-sur-Eaulne, Londinières, Douvrend, Envermeu, turning westward at Bellengreville and on to Ancourt, Martin-Église and joins the river Arques at Arques-la-Bataille.

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