The Burren

The Burren covers roughly 250 square kilometers of County Clare in exposed limestone pavement, a karst landscape formed as glaciers scraped away soil to leave cracked grey rock stretching to the horizon, giving it a stark, almost lunar appearance unlike anywhere else in Ireland. Despite its barren look, the cracks between the limestone slabs, known as grikes, shelter a remarkable mix of Arctic-alpine and Mediterranean plant species growing side by side, a botanical peculiarity that draws naturalists in particular during the May-to-June wildflower season. Scattered across the landscape are prehistoric sites including Poulnabrone Dolmen, a roughly 5,000-year-old portal tomb that is one of Ireland's most photographed megalithic monuments, along with ring forts and ancient field systems. Burren National Park at Mullaghmore offers marked walking trails through the terrain, while the Burren Perfumery and Aillwee Cave, a show cave with an underground river, sit nearby as complementary stops. Exploring the region properly, combining a walk, Poulnabrone, and one or two of the smaller attractions, takes a half to full day. The exposed limestone can be slippery when wet and offers little shelter from wind and rain, so weather-appropriate footwear and clothing matter throughout.