Thilleux () is a commune in the Haute-Marne department in north-eastern France.
Hydrography The commune is located in the hydrographic region "the Seine from its source to the confluence with the Oise (excluded)" within the Seine-Normandie basin. It is drained by the Voire, the Ceffondet, the Combe Ditch 01, the Grève Ditch 01, the Punaisots Ditch 01, and the Voyeu du Tertre Ditch 01.
The Voire, 56 km long, rises in the commune of Dommartin-le-Franc and flows into the Aube on its right bank at Molins-sur-Aube, after crossing 21 communes..
See also Communes of the Haute-Marne department
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