The Carnfree cluster of monuments is located a few kilometers to the south of Rathcroghan. This ridge has a number of barrows and other monuments spread across the summit, the most famous being Carnfree itself. Cairn Fraoch, is probably a barrow or even earlier monument that was re-used as the inauguration mound of the O'Conor Kings of Connaught in medieval times.
The inauguration mound of Carnfree is a cairn of stone ten meters in diameter and two meters high, built on a rock outcrop. The monument may be a small passage-grave or barrow of especial sanctity to the O'Conor sept. Fraoch was the step-son of Queen Medbh, promised to her daughter Fionnabhar.
The oldest monuments in the area are three megalithic structures, now quite ruined, at Sheegeeragh about one kilometer east of the ridge of Carnfree. These three megaliths are thought to have been passage-graves.