Ourcq
Ourcq river in Lizy-sur-Ourcq
Location
Country	France
Physical characteristics
Source
• location	Hauts-de-France
Mouth
• location	Marne
• coordinates	49°0′49″N 3°0′49″E / 49.01361°N 3.01361°E / 49.01361; 3.01361
Length	86.5 km (53.7 mi)
Basin features
Progression	Marne→ Seine→ English Channel

The Ourcq (French: [uʁk] ^ⓘ, Urc in 855) is an 86.5-kilometre-long (53.7 mi) river in France, a right tributary of the Marne.^[1] Its source is near the village Ronchères, and its course crosses the departments of Aisne, Oise, and Seine-et-Marne. It flows southwest through the towns of Fère-en-Tardenois, La Ferté-Milon, Mareuil-sur-Ourcq, and Crouy-sur-Ourcq, finally flowing into the Marne near Lizy-sur-Ourcq. Napoleon I made use of the river as a water source, and it supplied the city of Paris until Baron Haussmann's rebuilding of Paris.