Gamaches (French pronunciation: [ɡamaʃ]) is a commune in the Somme department in Hauts-de-France in northern France.

Gamaches is situated on the D1015, on the banks of the river Bresle, the border with Seine-Maritime, some 18 miles (29 km) southwest of Abbeville.Huge lakes to the west of the town are a paradise for naturalists, anglers and water sports enthusiasts.

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