The River Shannon is the major river on the island of Ireland, and at 360.5 km in length, is the longest river in the British Isles. It drains the Shannon River Basin, which has an area of 16,865 km2 (6,512 sq mi), – approximately one fifth of the area of Ireland.
County Cavan is a county in Ireland. It is in the province of Ulster and is part of the Northern and Western Region. It is named after the town of Cavan and is based on the historic Gaelic territory of East Breffny (Bréifne). Cavan County Council is the local authority for the county, which had a population of 81,201 at the 2022 census.
Cuilcagh is a mountain on the border between County Fermanagh and County Cavan. With a height of 666 metres (2,185 ft) it is the highest point in both counties. It is also the 170th highest peak on the island of Ireland, and Ireland's only cross-border county top. Water from the southern slope flows underground until it emerges some miles away in the Shannon Pot, the traditional source of the River Shannon. The area is sometimes referred to as the Cuilcagh Mountains.
Blacklion is a border village in west County Cavan, Ireland. It is situated on the N16 national primary road, just across the border from the County Fermanagh village of Belcoo.
The Marble Arch Caves are a series of natural limestone caves located near the village of Florencecourt in County Fermanagh, Northern Ireland. The caves are named after the nearby Marble Arch, a natural limestone arch at the upstream end of Cladagh Glen under which the Cladagh River flows. The caves are formed from three rivers draining off the northern slopes of Cuilcagh mountain, which combine underground to form the Cladagh. On the surface, the river emerges from the largest karst resurgence in Ireland, and one of the largest in the United Kingdom. At 11.5 kilometres (7.1 mi) the Marble Arch Caves form the longest known cave system in Northern Ireland, and the karst is considered to be among the finest in the British Isles.
The Owenbrean River, is a small river in County Fermanagh, Northern Ireland which flows down from Cuilcagh Mountain before sinking underground, eventually reaching the Marble Arch Cave system.
Glangevlin is a village in the northwest of County Cavan, Ireland. It is in the townlands of Gub (Glangevlin) and Tullytiernan, at the junction of the R200 and R207 regional roads. It is surrounded by the Cuilcagh Mountains and borders the counties of Leitrim and Fermanagh. A large stone known as 'Maguire's chair' is deposited on the right hand side of the road, roughly 4 miles from Glangevlin village, so-called because it was supposedly the inauguration site of the Maguire clan in medieval times.
The Cladagh River is a small river in County Fermanagh, formed from three rivers and a number of streams draining off the northern slopes of Cuilcagh mountain, which combine underground in the Marble Arch Cave system. On the surface, the River Cladagh emerges from one of the largest karst resurgences in the UK, before flowing through Cladagh Glen Nature Reserve and eventually draining into the Arney River.
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 (266 ft), 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 (289 ft). The continuation of the cave system contains 3.7 km (2.3 mi) 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 (354 ft).
Shannon Cave is an active stream passage cave which straddles the border of County Fermanagh, Northern Ireland and County Cavan in the Republic of Ireland.
The Caves of the Tullybrack and Belmore hills are a collection of caves in southwest County Fermanagh, Northern Ireland. The region is also described as the West Fermanagh Scarplands by environmental agencies and shares many similar karst features with the nearby Marble Arch Caves Global Geopark.
The Cuilcagh Lakelands Geopark formerly known as the Marble Arch Caves Global Geopark straddles the border between Northern Ireland and the Republic of Ireland. It is centred on the Marble Arch Caves and in 2001 it became one of the first geoparks to be designated in Europe.
Artur "Conrad" Kozłowski was a Polish cave diver who spent his last years in Ireland. Amongst other achievements in cave exploration, he set the record for the deepest cave dive in Great Britain and Ireland at a depth of 103 m (338 ft).
Pollatoomary is the deepest explored underwater cave in Ireland. It has been explored to an underwater depth of 113 metres (371 ft). The explored limit of Pollatoomary is also 23 metres (75 ft) deeper underwater than that of the terminal sump in Wookey Hole Caves in Somerset, England, which previously held the record for the deepest underwater cave in Britain and Ireland.
Derrylahan, an Anglicisation of the Gaelic, ‘Doire Leathan’ meaning The Wide Oak-wood, is a townland in the civil parish of Templeport, County Cavan, Ireland. It lies in the Roman Catholic parish of Glangevlin and barony of Tullyhaw.
Alteen is a townland in the civil parish of Kinawley, barony of Tullyhaw, County Cavan, Ireland. The local pronunciation is IL-Keen. A sub-division is called Tullynahunshin.
Michał Marek was a Polish cave diver who spent his last years in Ireland. As of May 2019, he holds the record for the deepest cave dive in Ireland at a depth of 113 m (371 ft).
