 Otter Creek forms the town border with Salisbury.Vermont Route 30, also known as the "Seth Warner Memorial Highway" and named for notable Vermonter Seth Warner, passes north–south through Cornwall, while Vermont Route 125 passes east–west through the northern part of the town.Vermont Route 74 leads southwest from the center of town, towards the Ticonderoga–Larrabees Point Ferry across Lake Champlain.