Slieve Beagh (Irish: Sliabh Beatha) is a mountainous area straddling the border between County Monaghan in the Republic of Ireland and County Fermanagh and County Tyrone in Northern Ireland. A point just east of its summit is the highest point in Monaghan; however the true summit is on the Fermanagh-Tyrone border. The point where the three counties meet, is referred to as the "Three County Hollow".