The Ornain is a 116 km long river

River

A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

 in northeastern France

France

The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

, right tributary of the Saulx

Saulx River

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...

 (Seine

Seine

The Seine is a -long river and an important commercial waterway within the Paris Basin in the north of France. It rises at Saint-Seine near Dijon in northeastern France in the Langres plateau, flowing through Paris and into the English Channel at Le Havre . It is navigable by ocean-going vessels...

 basin). It is formed near the village Gondrecourt-le-Château

Gondrecourt-le-Château

Gondrecourt-le-Château is a commune in the Meuse department in Lorraine in north-eastern France.On January 1, 1973 , the communes of Luméville-en-Ornois and Touraille-sous-Bois merged with and became part of it....

 by the confluence of the small rivers Ognon

Ognon

Ognon may refer to:Rivers in France* Ognon in Franche-Comté, tributary of the Saône* Ognon in Loire-Atlantique* Ognon, which becomes the Ornain after its confluence with the MalditeOthers*Ognon, Oise, commune in France...

 and Maldite. It flows generally northwest. Its course crosses the following départements

Départements of France

The departments of France are French administrative divisions. The 101 departments form one of the three levels of local government, together with the 22 metropolitan and 5 overseas regions above them and more than 36 000 communes beneath them...

and towns:

• Meuse
  Meuse
  Meuse is a department in northeast France, named after the River Meuse.-History:Meuse is one of the original 83 departments created during the French Revolution on March 4, 1790...
  
  : Gondrecourt-le-Château
  Gondrecourt-le-Château
  Gondrecourt-le-Château is a commune in the Meuse department in Lorraine in north-eastern France.On January 1, 1973 , the communes of Luméville-en-Ornois and Touraille-sous-Bois merged with and became part of it....
  
  , Ligny-en-Barrois
  Ligny-en-Barrois
  Ligny-en-Barrois is a commune in the Meuse department in Lorraine in north-eastern France.The town is in the arrondissement of Bar-le-Duc, beside the canal that links the Rivers Rhine and Marne, fifteen kilometres to the south east of Bar le Duc: it is the administrative seat of the canton ...
  
  , Bar-le-Duc
  Bar-le-Duc
  Bar-le-Duc, formerly known as Bar, is a commune in the Meuse département, of which it is the préfecture . The department is in Lorraine in north-eastern France-Geography:...
  
  , Revigny-sur-Ornain
  Revigny-sur-Ornain
  Revigny-sur-Ornain is a commune in the Meuse department in Lorraine in north-eastern France.-Geography:The Chée, a tributary of the Saulx, forms part of the commune's north-western border....
  
  
• Marne
  Marne
  Marne is a department in north-eastern France named after the river Marne which flows through the department. The prefecture of Marne is Châlons-en-Champagne...
  
  

The Ornain flows into the Saulx in Pargny-sur-Saulx

Pargny-sur-Saulx

Pargny-sur-Saulx is a commune in the Marne department in north-eastern France.Pargny-sur-Saulx is known for its tiles, which are exported sometimes to Singapore, giving it the nickname "the city of the tiles"...

. The part of the Marne-Rhine Canal

Marne-Rhine Canal

The Marne-Rhine Canal is a canal in north eastern France. It connects the river Marne in Vitry-le-François with the Rhine in Strasbourg. Combined with the canalised part of the Marne, it allows transport between Paris and eastern France. The original objective of the canal was to connect Paris...

 between Demange-aux-Eaux

Demange-aux-Eaux

Demange-aux-Eaux is a commune in the Meuse department in Lorraine in north-eastern France.-See also:*Communes of the Meuse department...

 and Sermaize-les-Bains

Sermaize-les-Bains

Sermaize-les-Bains is a commune in the Marne department in north-eastern France.-See also:*Communes of the Marne department...

runs parallel to the Ornain.