Coulston is a village and civil parish in Wiltshire, England, five miles northeast of the town of Westbury, just north of the B3098 road. The village lies under the north slope of Salisbury Plain and the parish extends south onto the Plain.

Westbury is a market town and civil parish in west Wiltshire, England. The town lies below the northwestern edge of Salisbury Plain, about 4 miles (6 km) south of Trowbridge and a similar distance north of Warminster.