The Lay (French pronunciation: [lɛ]) is a 120-kilometre (75 mi) river in the Vendée département, western France.

[1] Its source is at Saint-Pierre-du-Chemin and it flows generally southwest.

It flows into the Bay of Biscay between La Faute-sur-Mer and L'Aiguillon-sur-Mer, 20 km (12 mi) northwest of La Rochelle.

Its main tributaries are the Yon and the Smagne.

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