The Fortified Sector of the Escaut (Secteur Fortifié de l'Escaut), also known as the Fortified Sector of the Schelde, was the French military organization that in 1940 controlled the section of the Maginot Line between the French border with Belgium and Valenciennes, a distance of about . Named for the Escaut River (more commonly known as the Schelde), the Maginot line in the Escaut sector consists of a single position, the petit ouvrage Eth, together with its supporting casemate Jeanlain, as well as an upgraded fort of the Séré de Rivières system, the Fort de Maulde. The remainder of the sector's fortifications consist of blockhouses and casemates arranged along a line of principal resistance about behind the frontier, with a second line on the edge of the Raismes Forest. The Escaut secto