The Ourcq is a 87 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 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 Marne

Marne River

The Marne is a river in France, a right tributary of the Seine in the area east and southeast of Paris. It is long. The river gave its name to the départements of Haute-Marne, Marne, Seine-et-Marne, and Val-de-Marne....

. Its source is near the village Ronchères

Ronchères, Aisne

Ronchères is a commune in the Aisne department in Picardy in northern France.-References:*...

. Its course crosses the departments of Aisne

Aisne

Aisne is a department in the northern part of France named after the Aisne River.- History :Aisne is one of the original 83 departments created during the French Revolution on 4 March 1790. It was created from parts of the former provinces of Île-de-France, Picardie, and Champagne.Most of the old...

, Oise

Oise

Oise is a department in the north of France. It is named after the river Oise.-History:Oise is one of the original 83 departments created during the French Revolution on March 4, 1790...

 and Seine-et-Marne

Seine-et-Marne

Seine-et-Marne is a French department, named after the Seine and Marne rivers, and located in the Île-de-France region.- History:Seine-et-Marne is one of the original 83 departments, created on March 4, 1790 during the French Revolution in application of the law of December 22, 1789...

. It flows southwest through the towns of Fère-en-Tardenois

Fère-en-Tardenois

Fère-en-Tardenois is a commune in the Aisne department in Picardy in northern France, .-Population:-Personalities:It was the birthplace of Camille Claudel , sculptor and graphic artist.-Sights:...

, La Ferté-Milon

La Ferté-Milon

La Ferté-Milon is a commune in the Aisne department in Picardy in northern FranceIn La Ferté-Milon stand the ruins of an unfinished castle, whose façade was 200 m long and 38 m high. The singular form of the tower walls was probably designed to resist cannons and protect the gate. The façade is...

, Mareuil-sur-Ourcq

Mareuil-sur-Ourcq

Mareuil-sur-Ourcq is a village in northern France. It is designated municipally as a commune within the département of Oise.-References:*...

 and Crouy-sur-Ourcq

Crouy-sur-Ourcq

Crouy-sur-Ourcq is a commune in the Seine-et-Marne department in the Île-de-France region in north-central France.-External links:* * *...

, finally flowing into the Marne near Lizy-sur-Ourcq

Lizy-sur-Ourcq

Lizy-sur-Ourcq is a commune in the Seine-et-Marne department in the Île-de-France region in north-central France.-External links:* * * *...

. Napoleon I

Napoleon I

Napoleon Bonaparte was a French military and political leader during the latter stages of the French Revolution.As Napoleon I, he was Emperor of the French from 1804 to 1815...

 instituted the river as a water source, and it supplied the city of Paris

Paris

Paris is the capital and largest city in France, situated on the river Seine, in northern France, at the heart of the Île-de-France region...

 until Baron Haussmann's rebuilding of the city

Haussmann's renovation of Paris

Haussmann's Renovation of Paris, or the Haussmann Plan, was a modernization program of Paris commissioned by Napoléon III and led by the Seine prefect, Baron Georges-Eugène Haussmann, between 1853 and 1870...

.