 It is likely that the valley was formed under conditions akin to those required to form a dry valley.Amersham on the Hill is built on the north side of the Misbourne valley, on a small plateau that forms the watershed between the Misbourne and the neighbouring River Chess.The town is located at the junction of the A355 from Slough and Beaconsfield, the A404 linking Maidenhead, High Wycombe and Rickmansworth, the A416 from Chesham and Berkhamsted and the A413.