Chew Green is the site of the ancient Roman encampment, commonly but erroneously called Ad Fines (Latin: The Limits[1]) on the 1885-1900 edition of the Ordnance Survey map,[2] in Northumberland, England,[3] 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.

The Roman remains were overlaid with evidence of the medieval settlement of Kemylpethe[4] 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.

[5] The site is within the Northumberland National Park and within the Military Training Area at Otterburn.