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5
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Mountain bike trails around Letter offer access to the diverse landscapes of County Donegal, Ireland. The region is characterized by rugged mountains, tranquil lakes, and extensive woodlands, providing varied terrain for mountain biking. Riders can explore areas near Glenveagh National Park, which features scenic views and remote wilderness. Historic castles and distinctive peaks like Errigal and Muckish Mountains add to the natural beauty of the area.
Last updated: June 28, 2026
2
riders
37.7km
02:56
480m
480m
The Scarplands Cycle Trail offers a moderate mountain biking experience through a remote and windswept landscape. You will navigate coarse gravel and forest roads, winding past forest breaks and vastβ¦
66.4km
05:16
1,030m
1,030m
This difficult mountain biking route, the Tully Castle to Cliffs of Magho viewpoint and Ballintempo Forest loop, covers 41.3 miles (66.4 km) with a significant 3381 feet (1031 metres) ofβ¦

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30.2km
01:58
220m
220m
Embark on the Caldwell Castle to Derrin Mountain loop, a mountain biking adventure spanning 18.8 miles (30.2 km) through the Fermanagh Lakelands. This route, with a moderate difficulty suitable forβ¦
54.9km
03:58
610m
610m
Embark on the Pettigo to Lough Derg and St Patrick's Purgatory loop for a moderate mountain biking adventure that blends scenic beauty with deep history. This 34.1 miles (54.9 km)β¦
30
riders
106km
09:06
1,560m
1,560m
Hard mountain bike ride. Very good fitness required. Suitable for all skill levels.
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Fast rolling forestry gravel roads that cut through this wild landscape, passing over Lough Nabrickboy with views across to surrounding deep-blue loughs.
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"continual slur on Irish caving" It's actually only a few hundred metres is accessible and it's total length is thought to be 2km. No where near the longest cave in Ireland. Consider a trip in only if well equipped with a good light and helmet. Alternatively/also consider visiting McKenzies back lounge just down the road. A much drier watering hole. ;)
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From here over the Lough you can see St Patrick's Purgatory which is an ancient pilgrimage site that is suggested to have not been interrupted for fifteen hundred years, with it continuing in the present day. Its importance in medieval times is clear due to its present on maps all over Europe as early as the 15th century. It was the only Irish site designated on Martin Behaim's world map of 1492.
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On the Pilgrim's Path, which runs around the edge of the lake, you will find St Brigid's Well.
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Pollnagollum Cave (meaning Hole of the Dove) is the longest cave system in Ireland. The cave system is complex and fascinating and is fed by a tumbling waterfall that topples off a limestone cliff. Watch your stepping here as rocks can be unstable and slippery, and don't forget your camera for some awesome shots.
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From here over the Lough you can see St Patrick's Purgatory which is an ancient pilgrimage site that is suggested to have not been interrupted for fifteen hundred years, with it continuing in the present day. Its importance in medieval times is clear due to its present on maps all over Europe as early as the 15th century. It was the only Irish site designated on Martin Behaim's world map of 1492.
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Meenameen Lough sits in the wonderful Lough Navar Forest. It is peaceful and quiet with plenty of tree cover, providing the perfect spot to take a break and take in this unspoilt landscape.
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The Letter area, primarily referring to Letterkenny and County Donegal, Ireland, offers a diverse range of mountain bike trails. You'll find routes traversing rugged mountains, tranquil lakeshores, and extensive woodlands. The network includes options for easy, moderate, and difficult ability levels, often connecting historical sites and national parks like Glenveagh.
Yes, there are trails suitable for beginners and families. For instance, the Caldwell Castle to Derrin Mountain loop is graded as easy, leading through forested areas and past historical sites. The region's overall network includes easy routes designed to be accessible to various fitness and skill levels.
Experienced riders looking for a challenge can tackle routes like the Tully Castle to Cliffs of Magho viewpoint and Ballintempo Forest loop. This difficult 41.3-mile (66.4 km) path traverses dense forest and offers panoramic views from various viewpoints, requiring a good level of fitness and technical skill.
Yes, many of the mountain bike routes in the Letter area are designed as loops. Examples include the Caldwell Castle to Derrin Mountain loop and the Tully Castle to Cliffs of Magho viewpoint and Ballintempo Forest loop. These circular routes allow you to start and finish at the same point, making logistics easier.
The trails around Letter offer access to several historical and natural attractions. You can encounter sites like the Castle Caldwell Ruins, the Tully Castle Ruins, and the unique Janus Stones of Caldragh Cemetery. Natural highlights include the stunning View of Lough Erne from Cliffs of Magho and various serene lakes like Carrick Lough.
While mountain biking is possible year-round, the best time to visit County Donegal for mountain biking is generally from late spring to early autumn (May to September). During these months, you can expect milder weather, longer daylight hours, and drier trail conditions, making for a more enjoyable experience. However, the region's weather can be unpredictable, so always be prepared for changing conditions.
Yes, services like Grassroutes, located near Letterkenny, offer electric and hybrid bike hire. They also provide mapped routes to help you explore Donegal's beautiful sights, including the Wild Atlantic Way and Glenveagh National Park. This can be a great option if you're visiting without your own bike or prefer a guided experience.
The duration of mountain bike trails varies significantly based on their length and difficulty. For example, the moderate Scarplands Cycle Trail, which is 23.4 miles (37.7 km) long, typically takes around 2 hours and 55 minutes. More challenging routes, like the 41.3-mile (66.4 km) Tully Castle to Cliffs of Magho viewpoint and Ballintempo Forest loop, can take over 5 hours to complete.
The mountain bike trails around Letter are highly regarded by the komoot community, with an average rating of 5.0 stars based on user reviews. Riders often praise the diverse landscapes, the mix of historical sites and natural beauty, and the variety of trails catering to different skill levels.
Yes, the Pettigo to Lough Derg and St Patrick's Purgatory loop is a moderate 34.1-mile (54.9 km) mountain bike route that takes you past these significant landmarks. This trail offers a unique blend of natural scenery and cultural heritage.
The terrain in County Donegal is quite varied. You can expect a mix of rolling hills, forested paths, and potentially rugged sections, especially on more difficult trails. The region's landscape includes diverse features from national parks to distinctive peaks like Errigal and Muckish Mountains, providing a dynamic riding experience.


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