Barrow-wights: Description (p2)

East of the Brandywine River beyond the Old Forest were the Barrow-downs, the most ancient burial ground of Men in Middle-earth. There were no trees nor water there, but only grass and turf covering dome-shaped hills crowned with monoliths and great rings of white stone. These hills were the burial mounds that were made in the First Age of the Sun for the Kings of Men.