In World War II, the Atlantic pockets were locations along the coasts of the Netherlands, Belgium and France chosen as strongholds by the occupying German forces, to be defended as long as possible against land attack by the Allies.
The locations are known in German as Atlantikfestungen (lit. "Atlantic strongholds") but are known in English as "Atlantic pockets".
Six of the Atlantic pockets were captured by the Allies between June and October 1944. Others were placed under siege. Three surrendered in April 1945, and the remainder in May 1945.