The Marble Arch Caves are a key site in the Marble Arch Caves UNESCO Global Geopark. They are one of Europe’s finest show caves and provide a glimpse into a fascinating, natural underworld of rivers, winding passages and lofty chambers. Join staff to hear about the hydrology of these fascinating caves while watching the Owenbrean River turn a luminous shade of green! Dye tracing is a method used by hydrologists to track and trace the flow of underground streams and rivers. Learn about the importance of dye tracing in the field of Geology and the equipment used to carry out these exciting experiments. Find out about the tracing experiments that have been carried out in the wonderfully wet County Fermanagh!