Agharahan (from Irish Achadh Rathain, meaning "field of the ferns") is a townland is situated in the land division of Old Barr in the parish of Devenish, Barony of Magheraboy. It has an area of 746,831 m² / 74.68 hectares /0.29 square miles/184.55 acres / 184 acres. The townland runs from the high plateau in the Knockmore Scarpland at 766 ft down to the lowlands at 177 ft above sea level and is between the townlands of Old-Barr to the west, Killydrum to the south, Aghakeeran to the north, Drumbegger to the east and Lattonagh to the south.