Great Asby Scar is a Site of Special Scientific Interest (SSSI) and National Nature Reserve in Cumbria, UK.

A "scar" is the local name for a limestone pavement⁠—an area of limestone rock which has been eroded by an overlying ice sheet during the Last Glacial Maximum and then fissured by rain to form a flat rocky pattern which resembles man-made pavement.

[3] It is in the Orton Fells in the district of Westmorland and Furness, near the village of Great Asby.

This is known as Castle Folds and, as it dates back to Roman times, is protected as a scheduled monument.

[4] The region has been described as a matrix of both acidic and alkaline grassland, dominated by blue moor-grass and matgrass.