Best attractions and places to see around Letterkeen, located within the Wild Nephin National Park in County Mayo, Ireland, offers a landscape of rugged natural beauty and extensive walking trails. The region is characterized by its wilderness designation, featuring the Nephin Beg Mountains and Letterkeen Woods. It provides numerous opportunities for outdoor exploration, appealing to nature enthusiasts and hikers. The area emphasizes conservation and offers a true sense of untamed nature.
Last updated: July 6, 2026
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During WW2 Castle Archdale was a major base for flying boats and housed up to 2,500 people. Buildings such as these would have been a central location for the RAF fighters who lived here. Sometimes exhibitions are held in these courtyards to display some of the key historical notes of the use of this area during the war.
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Old Castle Archdale is situated on Castle Hill within a 520 hectare coniferous and mixed broadleaved forest. The castle was built in the 1600s and was the main castle on this former estate before its successor took it's place in the 1800s, Castle Archdale.
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Drumskinny Stone Circle is one of five in the area. It dates back to 2000BC and is thought to have been used for religious ceremonies, calendar functions or astronomical observations. There are 39 stones that make up the circle which are all placed around a small cairn.
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Old Castle Archdale sits on a forest clifftop. It is named 'old' to distinguish it from its successor, the 18th century Castle Archdale. The castle was built by an Englishman from Suffolk who had been granted the estate in 1612 after paying 5 pounds, 6 shillings and 8 pence for the 1000 acres of land. During the Irish Rebellion of 1641 the castle was captured by Rory Maguire as part of the uprising to retake his lands that had been lost in 1607. The heir to the castle was saved by his nurse however the other children were killed. After the castle was returned to the family it was repaired and lived in until 1689. The castle saw its end during the Williamite Wars when the castle was burnt out and abandoned.
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This fortified house is on Tully Point and built for Sir John Hume who occupied the house until 1641 when it was attacked by John Maguire and burned on Christmas Eve with all its inhabitants massacred. After that it was not lived in again. There is a visitors centre in a restored farmhouse that has an interesting exhibition telling a number of stories relating to the castle. To visit the castle be sure to step off the bike as it is on foot only!
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Drumskinny Stone Circle is one of five stone circles located in the area. Although its exact purpose isn't known, it is thought to have been used for religious ceremonies, calendar functions, or astronomical observations. The circle is made up of 39 stones placed around a small round cairn. Entrance to the site is free.
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Perched atop a cliff and surrounded by thick forest, it's easy to imagine how life would have been hundreds of years ago as you wander the crumbling walls of Old Castle Archdale. Built in 1615 by Englishman John Archdale, the castle was captured by the Irish in the Irish Rebellion of 1641. The castle was inhabited until 1689, when it was destroyed by fire and abandoned.
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This fortified house and bawn are set on Tully Point and were built for Sir John Hume who occupied the house until 1641 when it was attacked and burned on Christmas Eve by Rory Maguire and the inhabitants massacred. It was not lived in again. A visitor’s centre, located in a restored farmhouse, houses an exhibition telling local stories relating to the castle. (https://discovernorthernireland.com/things-to-do/tully-castle-p675521)
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Letterkeen Woods offers several well-marked loop walks starting from the Brogan Carroll Bothy. These include the 6 km Blue Loop (Bothy Loop), the 10 km Red Loop (Lough Aroher Loop), and the more challenging 12 km Purple Loop (Letterkeen Loop). Portions of the long-distance Bangor Trail and Western Way also integrate into these loops, offering diverse hiking experiences.
Yes, Letterkeen and the surrounding Wild Nephin National Park offer family-friendly options. The Ballycroy Visitor Centre, while not directly in Letterkeen, provides an accessible nature trail called the Tóchar Daithí Bán Trail, which is just under 2 km and can be completed in about 30-40 minutes. Additionally, some historical sites like Tully Castle Ruins and Drumskinny Stone Circle are categorized as family-friendly.
The area around Letterkeen is rich in history. You can explore the unique Janus Stones of Caldragh Cemetery, which are ancient pre-Christian stone figures. Other notable historical sites include the crumbling walls of Old Castle Archdale, built in the 1600s, and Tully Castle Ruins, a fortified house with a visitor's centre nearby telling local stories. Don't miss the Drumskinny Stone Circle, Cairn and Alignment, dating back to 2000BC.
Letterkeen is part of the Wild Nephin National Park, offering a rugged natural landscape. Key features include the extensive Letterkeen Woods with majestic conifers, the dramatic Nephin Beg Mountains, the scenic Altaconey River with its footbridges, and the picturesque Lough Avoher. The entire area is designated as Ireland's first wilderness, emphasizing untamed nature.
Letterkeen's natural beauty can be enjoyed year-round, but the best time for walking is generally during the drier months to fully appreciate the trails and views. The area's weather can be unpredictable, so it's always advisable to check local forecasts before heading out. The remote location also makes it ideal for experiencing the Mayo Dark Sky Park, especially on clear nights.
The primary starting point for the Letterkeen loop walks is the Brogan Carroll Bothy, which serves as a crucial trailhead. Parking facilities are available at this location, providing convenient access to the various trails within Letterkeen Woods.
While Letterkeen itself is a wilderness area, the Ballycroy Visitor Centre, located within the Wild Nephin National Park, serves as the main information point for the park. It features an interactive exhibition, knowledgeable guides, and the Ginger & Wild Café, making it a valuable stop for visitors to the region.
Beyond walking, the Letterkeen area offers various cycling opportunities. You can find mountain biking trails such as the 'Drumskinny stone circle and Lough Bradan loop' or the 'Old Castle Archdale – Rossmore Point Beacon loop from Lisnarrick' by exploring the MTB Trails around Letterkeen guide. For road cycling, routes like the 'Boa Island and Pettigo loop from Old Castle Archdale' are available in the Road Cycling Routes around Letterkeen guide. There are also general cycling routes, including sections of the 'Kingfisher Cycle Trail - Northern Loop', detailed in the Cycling around Letterkeen guide.
Many outdoor areas in Ireland, including national parks and forests, have specific rules regarding dogs to protect wildlife and ensure visitor safety. It is recommended to check the official guidelines for Wild Nephin National Park and Letterkeen Woods on the National Parks and Wildlife Service website (nationalparks.ie) for the most current information on dog-friendly policies and any restrictions.
Letterkeen is an integral part of the Wild Nephin National Park, which is designated as Ireland's first wilderness. This designation emphasizes conservation and offers a true sense of untamed nature, providing a unique opportunity to immerse oneself in a rugged and tranquil natural environment. The park is dedicated to preserving its wild character and biodiversity.
Yes, Letterkeen is recognized for its exceptional night skies. It has been identified as an optimal site for an observatory within the Mayo Dark Sky Park. This highlights its remote location and minimal light pollution, making it an excellent spot for stargazing and experiencing the natural darkness.


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