Marble Arch National Nature Reserve

Marble Arch National Nature Reserve, located near Florencecourt in County Fermanagh, Northern Ireland, features a remarkable series of limestone caves and the stunning Marble Arch, a natural limestone arch. This reserve is renowned for its extensive karst landscape, formed by three rivers draining from Cuilcagh Mountain, and is home to the longest known cave system in Northern Ireland, making it one of the finest karst areas in the British Isles. Wildlife enthusiasts can look forward to a variety of species, particularly butterflies such as the Meadow Brown and Green-veined White, which peak in June and May, respectively. June is the best month for sightings, with activity peaking around 01:00. Other notable species include the Ringlet in July and the Small Tortoiseshell in September, while fungi like the Spangle Waxcap and Blackening Waxcap can be spotted in October.