Septeuil (French pronunciation: [sɛptœj]) is a commune in the Yvelines department in the Île-de-France region in north-central France.
Septeuil is traversed by a small river, la Flexanville. This waterway flows through eight other communes for a total distance of 11.1 kilometres (6.9 mi). The Flexanville is a tributary of the Vaucouleurs which in turn empties into the Seine.[3]
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