Cashelmore, also called Clogher Stone Fort, is a stone ringfort (cashel) and National Monument located in County Sligo, Ireland.
Cashelmore is located 1.6 km (1 mile) southwest of Monasteraden, to the west of Lough Gara.
Cashelmore may have been first settled in the Bronze Age (2000âÂÂ500 BC). The stone cashel walls are probably early Iron Age (5thâÂÂ1st century BC), but could be earlier. It could be the Rath Clochair mentioned in the Annals of the Four Masters: 871 BC "Lugaid ÃÂardonn son of ÃÂnna Derg, the 41st king of Ireland, was killed by SÃÂrlám son of Finn in the battle of Rath Clochair."
Restoration work took place in the 19th century.
The fort has an internal diameter of . The walls are high and thick.
Five stairways lead to the top of the wall.
The entrance is called the Steward's Gate. There is a mural passage and two souterrains. The souterrains have dry stone walls and are roofed with large stone flags.