Swarthy Hill Milefortlet 21, 80m South of the Saltpans, Part of the Roman Frontier Defences Along the Cumbrian Coast
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Cumbria County Council
Allerdale Borough Council
SJ067067 (306731, 540032)
Supposed site of Roman Milefortlet No 21; doubtful position based upon small scale exploration at measured position; for the actual position of this milefortlet see NY 04 SE 22.