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 miles (13 km) north of Rochester and 9 miles (14 km) 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 acres (7 ha) 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.

• Bremenium
• Featherwood Roman Camps
• Quintus Lollius Urbicus
• History of Northumberland
• Barrow Burn
• Windy Gyle

• Roman Britain
• Keys to the Past
• Northumberland National Park