The port of Saint-Georges-de-Rex is the only one not established on the edge of the hillside. The harbor and its access channel (Rimonboeuf channel), entirely dug in the limestone from 1850 to 1870 to approach the dock as close as possible to the village and the town with 150 hectares of marshland, are connected to the Chail canal and the Grande Rigole de La Garette, towards Coulon, Marans or Niort. It is made up of a gently sloping paved slipway, cut stone quays with two access points and a high masonry spillway helping to maintain water in the port. The natural light bulb port is restored as part of the Major Works of the Marais Poitevin.