These milefortlets and intervening stone watchtowers extended from the western end of Hadrian's Wall, along the Cumbrian coast and were linked by a wooden palisade.

Milefortlet 17 is situated at Dubmill Point, southwest of the village of Mawbray in the civil parish of Holme St Cuthbert.

[1] All that remains to be seen on the ground is a slight depression defining the ditch on the east and south sides.

[1] Each milefortlet had two associated towers, similar in construction to the turrets built along Hadrian's Wall.

[2][3] The locations of both towers are uncertain, and their positions have been estimated by measurement to adjoining Roman frontier works.