Glendalough Lap of the Gap Marathon

The Glendalough Lap of the Gap Marathon is an annual, challenging road running event held in Ireland's Wicklow Mountains, featuring a full 42.2 km marathon and a 'Glen to Glen' half-marathon, with the 9th edition taking place on Saturday, May 23, 2026. Known for scenic views of the Glenmacnass Waterfall and Lough Tay, it offers a tough, hilly course (800m elevation gain).

The race is highly scenic, passing through the Wicklow Mountains National Park, but is not considered a "personal best" (PB) course due to its challenging, undulating nature. Entries are typically sold in tiers, with options for deferral.