Noon's Hole

Noon's Hole lies about 5 km northwest of the centre of Boho, in the townland of Old Barr in the parish of Devenish, County Fermanagh, close to the border with Boho parish. The cave is under part of the escarpment on the east side of the Glenade Sandstone uplands. At 81 m, this pothole was thought to have the deepest shaft in Ireland, but this honour was passed to the nearby Reyfad Pot, which contains an entrance shaft of 88 m. The continuation of the cave system contains 3.7 km of passage, and it connects to the resurgence at Arch Cave through three cave dives, making this system the 8th deepest in Ireland, at 108 m.Noon's Hole was previously called "Sumera", meaning "abyss", but gained notoriety and a new name in the 1820s, following the notorious murder of Dominick Noone, whose body was thrown into the cave. Ordnance Survey maps still use both names.

Source: Wikipedia