Chew Green is the site of the ancient Roman encampment, commonly but erroneously called Ad Fines (Latin: The Limits ) on the 1885-1900 edition of the Ordnance Survey map, in Northumberland, England, 8 mi north of Rochester and 9 mi west of Alwinton. The encampment was adjacent to Dere Street, a Roman road that stretched south to York (Eboracum), and almost on the present-day border with Scotland. Archaeological excavation at Chew Green has uncovered a complex of Roman military camps consisting of a Roman fort, two fortlets, two camps and a section of Roman road. The Roman remains were overlaid with evidence of the medieval settlement of Kemylpethe that included a small chapel, although the evidence for this latter is based on reports of an undocumented excavation in the 1880s and must be regarded as insubstantial. The largest camp structure is a square that encloses about 17 acre with a defensive rampart and ditch. Evidence inside the fort indicates it was used as permanent settlement. The encampment likely served only as a military base, not a colonial settlement. The site is within the Northumberland National Park and within the Military Training Area at Otterburn.