Killarney National Park.

Ireland’s oldest national park is a striking 102-square-kilometer expanse where rugged wilderness meets centuries of history. Established in 1932, it protects the country's largest remaining native forest, international-grade oak and yew woodlands, and Ireland's only native herd of red deer. Beyond its ecological credentials, the UNESCO Biosphere Reserve is defined by its diversity of landscapes. Visitors can wander from the shores of the Lakes of Killarney to the dramatic Torc Waterfall, or explore architectural relics like the 15th-century Ross Castle, Muckross Abbey, and the grand Muckross House. With paved paths, challenging trails linked to the Kerry Way, and views of the towering MacGillycuddy’s Reeks, it offers an accessible, multifaceted slice of the Irish countryside.