The caves are named after the nearby Marble Arch, a natural limestone arch formed by the Cladagh River.
The cave system is carved into limestone that dates back approximately 330 million years to the Carboniferous period.
The subterranean river feeding the caves is formed by the confluence of the Sruh Croppa and Owenbrean rivers.
The caves were first explored in 1895 by French caver Édouard-Alfred Martel and local naturalist Lyster Jameson.
The site is part of the first UNESCO Global Geopark, designated in 2001.
Some chambers contain delicate 'straw' stalactites, which are thin, hollow tubes formed by singular drops of mineral-rich water.
The cave atmosphere contains high humidity levels, which encourages the growth of specific cave-adapted micro-organisms.
The water levels in the caves are highly sensitive to rainfall and can rise rapidly during heavy storms.
The Marble Arch Caves are a show cave system located in the UNESCO-designated Marble Arch Caves Global Geopark in County Fermanagh. The tour utilizes both subterranean boat trips along a subterranean river and guided walking paths to navigate limestone passages. The cave system was formed by the Cladagh River and remains active with ongoing geological processes. Visitors can observe stalactites, stalagmites, and flowstones illuminated throughout the subterranean chambers. The site is situated at the base of Cuilcagh Mountain, part of the wider Fermanagh karst landscape. The cave temperature remains consistently cool throughout the year regardless of external weather conditions.
The illuminated boat landing area, where the reflection of the cave walls on the water provides a symmetrical composition.
Book tickets well in advance as tours have strict capacity limits.
Bring a warm waterproof jacket, as the cave environment is consistently cold and damp.
Arrive at the visitor center early to allow time for the walk to the cave entrance.
Do not attempt to visit without a pre-booked ticket, as walk-ins are rarely accommodated; avoid wearing open-toed shoes or sandals.
Closed annually during the winter season; generally closed on Mondays and Tuesdays during off-peak periods.
Wear sturdy, non-slip footwear; do not touch cave formations as oils from skin damage mineral deposits; flash photography is strictly prohibited.
