Magh Slécht (sometimes Anglicised as Moyslaught) is the name of an historic plain in Ireland. It comprises an area of about three square miles (8 km²) situated in the south-eastern part of the Parish of Templeport, Barony of Tullyhaw, in the west of County Cavan. It is bounded on the south by Templeport Lough, on the north by Slieve Rushen mountain, on the east by the Shannon–Erne Waterway, and on the west by the River Blackwater. Magh Slécht formed part of the Province of Connacht until the 16th century when it was made part of the Province of Ulster.