The Saulx () is a 115 km long river in France, right tributary of the Marne. Its source is near the village Germisay. It flows generally northwest, through the following départements and towns:
Haute-Marne: Effincourt Meuse: Montiers-sur-Saulx, Stainville Marne: Sermaize-les-Bains, Pargny-sur-Saulx, Vitry-le-François
The Saulx flows into the Marne in Vitry-le-François. Its main tributaries are the Ornain and the Chée. The part of the Marne-Rhine Canal between Vitry-le-François and Sermaize-les-Bains runs parallel to the Saulx.
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