Orge

Many of the local councils maintain parks on the banks of the river. A syndicat has been formed to link the parks of 32 communes.^[2] The result is a footpath that ends in Athis-Mons, where the Orge flows into the Seine. Bicycles are allowed on the footpath although pedestrians have right of way. Motorised vehicles are not allowed.

In May 1909 a venue for aviation races and exhibitions, Port-Aviation, opened to the public in Viry-Châtillon as the world's first purpose-built aerodrome. The airfield, often referred to by the misnomers "Juvisy Airfield" or "Juvisy" due to its proximity to Juvisy-sur-Orge, was located at a point where the Orge forked into two branches, one of which ran along Port-Aviation's northwestern perimeter and the other across the northwestern, northern, and northeastern portions of the airfield itself. Flooding of the Orge that began in mid-January 1910 forced the closure of Port-Aviation and the evacuation of its hangars until March 1910. Although Port-Aviation operated as a civilian aviation venue until 1914 and as a military aviation training site during World War I, it closed and was abandoned during 1918 in part because it was prone to flooding by the Orge. A housing district also named Port-Aviation was constructed on the site of the former airfield between 1919 and 1933 and also suffered from flooding until 1932, when the Orge was canalized in the area and a pumping station was installed.^{[3][4][5][6][7]}

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  Viaduct over the Orge
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  Signpost for the Promenade de l'Orge
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  Confluence of the Orge and Seine in Athis-Mons