The term earthwork covers a wide range of man-made features, from the raised raths and ring-forts that once served as enclosed farmsteads, to boundary banks, burial mounds, and the subtle terracing left by long-abandoned agriculture. Without knowing which of these Larass presents, the feature occupies a curious position: officially acknowledged as a monument, but without a public-facing account of what it actually is or when it was made.

Larass is a small townland in Sligo, a county whose landscape carries an unusually dense concentration of prehistoric and early medieval remains, shaped in part by the relatively undisturbed nature of its upland and rural areas. Earthworks of various kinds survive across this part of Connacht precisely because the land was never subjected to the intensive development that erased so many comparable features elsewhere in Ireland. The classification alone, however, tells us only that something survives above ground, or at least did at the time of survey, and that it was considered significant enough to be added to the national record of monuments.