Swarthy Hill milefortlet 21, 80m south of the Saltpans, part of the Roman frontier defences along the Cumbrian coast

The National Heritage List for England records Swarthy Hill milefortlet 21, 80m south of the Saltpans, part of the Roman frontier defences along the Cumbrian coast as a scheduled monument. The saved point comes from the centre supplied by the official record. Listing does not by itself mean that the public may enter the place.