Known locally by the rather evocative names of ‘Giants Graves’ or ‘Famine Graves’, these features have captured the imagination of locals for generations. The mounds vary in size, with the largest measuring 8 metres long, 4.3 metres wide and standing 1.5 metres high, whilst the smallest, positioned slightly southeast of the others, is a more modest 3 metres by 1 metre and rises just half a metre from the ground.

The two middle mounds complete this intriguing quartet; one stretches 6.6 metres in length and 2 metres in width, whilst the other measures 7.4 metres by 1.5 metres, both reaching approximately a metre in height. Their arrangement from north to south suggests deliberate placement rather than natural formation, though their true purpose remains unclear. The local folklore names hint at burial sites, whether from prehistoric times when giants supposedly roamed the land, or from more recent tragic periods in Irish history.

These earthen structures were documented in the Archaeological Survey of County Donegal, compiled by Brian Lacey and his team in 1983, which catalogued field antiquities from the Mesolithic Period through to the 17th century. Located near Lag in rough, relatively inaccessible terrain, the mounds have likely survived precisely because of their remote position, protected from agricultural development and modern interference that might have destroyed similar features elsewhere in the county.