The parish of Fordham covers in an irregular shape. Its southern border is the county border with Suffolk and most of its south-eastern border with Snailwell follows the path of the River Snail. It also borders Chippenham and Isleham to the east, Soham to the north, and Burwell to the west, as well as having a short boundary with Wicken at its western tip. In 1953 the civil parish was merged with that of Landwade, a tiny parish of only , although Landwade and its ecclesiastical parish are both in Suffolk.