Bourthes (French pronunciation: [buʁt]; West Flemish: Boorte) is a commune in the Pas-de-Calais department in the Hauts-de-France region in northern France.

[3] A village situated some 15 miles (24 km) southeast of Boulogne-sur-Mer at the D128 and D131 crossroads.

The source of the river Aa is found here.

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