 It is on the south bank of the River Tweed, which marks the border between England and Scotland.The ruins of Wark on Tweed Castle, originally an early 12th-century motte-and-bailey, lie at the west end of the village.The border between Scotland and England runs down the middle of the River Tweed, but between the villages of Wark and Cornhill, the Scottish border comes south of the river to enclose a small riverside meadow around to .