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In page Durham boat:

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These boats would have varied from place to place, from builder to builder and also evolved over time, however in general, they were 40 feet (12 m) to 60 feet (18 m) long and 8 feet (2.4 m) wide. The bottoms were planked and flat, without a keel, but possibly with a larger “keel-plank” in the center. The sides were vertical and parallel, tapering to sharp at either end. Unlike the bateau, they were decked at both ends and had cleated walking boards along either side. They would have been fitted with a long “sweep” or steering oar and one mast which usually held two square sails.[1]