Best lakes around Slievenalargy are found within the broader Mourne Mountains region, a landscape renowned for its water bodies. Slievenalargy, also known as Tullynasoo Mountain, is an elevation of 280 meters (919 feet) within this picturesque area in County Down, Northern Ireland. The region offers diverse natural features, including mountain lakes and reservoirs. Visitors can explore various trails and routes that lead to these water features.
Last updated: June 29, 2026
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The route takes you along the Silent Valley Reservoir on a well-developed, asphalt road that is also suitable for less experienced drivers. However, it can be slippery in wet weather, so caution is advised. A special highlight is the impressive dam wall of the Ben Crom Reservoir, which blends harmoniously into the surrounding mountain landscape. Please note, however, that access to the park is subject to a fee.
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A very beautiful castle in the forest
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See if you can find your way to the peace bell in the centre of the maze. Castlewellan Peace Maze, is one of the world's largest permanent hedge mazes representing the puzzle that was to become a peaceful future for Northern Ireland. To encourage a sense of common ownership, the maze was planted by people from all over Northern Ireland, plus nearly 4,000 school children. Planted in 2000
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Stunning views from here across the Silent Valley and the Mourne Mountains. Ben Crom is a gravity dam, meaning it is made of concrete and designed so that the dam's own weight stabilises it against the force of the water. The dam was completed in 1957
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The Blue Lough is a picturesque mountain lake embedded in a wide trough valley in the southern Mournes. It's the perfect place, to pause, catch your breath, and enjoy the impressive nature.
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It's both a surprise and a delight to find a sandy beach high up in the mountains. This small shore, formed by the beautiful Lough Shanna, makes a perfect spot for a relaxing sit-down and picnic before heading up Slieve Doan.
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This extraordinary castle sits in Castlewellan Forest Park and has a grand view over the lake. From the walking and cycle trail around the lakeside, you can enjoy the fantastic vantage point and admire the castle's turrets. Built in the mid 1800s, the castle was owned by the Annesley family. Its grounds contain a phenomenal arboretum which has been considerably extended and includes giant sequoias. The building is now a Christian conference centre and isn't open to the public. It's well worth seeing from the outside though, and the lawns around the lake are a perfect place for a picnic.
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The region around Slievenalargy, within the broader Mourne Mountains, offers a diverse range of water bodies. You'll find picturesque mountain lakes like Blue Lough, large man-made reservoirs such as Silent Valley and Ben Crom, and even lakes associated with parklands like the one overlooked by Castlewellan Castle. There are also unique features like the Sandy beach at Lough Shanna.
Yes, several spots are great for families. Castlewellan Forest Park, home to Castlewellan Castle, offers trails and picnic areas. The Castlewellan Peace Maze is also a fun, family-friendly attraction within the park. For a more relaxed experience, Castle Park Boating Pond in Newcastle provides swan boat rides. Camlough Lake also features upgraded facilities like picnic areas and children's play equipment.
The area around Slievenalargy and its lakes is excellent for various outdoor activities. You can enjoy extensive walking and hiking routes, from accessible strolls around Silent Valley Reservoir to challenging mountain treks to places like Blue Lough or Lough Shannagh. Water sports like swimming, canoeing, and kayaking are popular at Camlough Lake. For cycling enthusiasts, there are numerous MTB Trails and Gravel biking routes, especially around Castlewellan Lake. You can also find running trails throughout the region.
For scenic walks, consider the trails around Silent Valley Reservoir, which offer breathtaking views of the Mourne Mountains and the impressive Mourne Wall. The walk to Blue Lough, often starting from Carrick Little car park, provides a sense of being deep within the mountains. Lough Shannagh, accessible via the Banns Road track, offers secluded beauty and stunning mountain vistas. Lakeside walking trails are also available at Camlough Lake.
Yes, the region has notable historical features. The Mourne Wall, a 35 km dry-stone wall, encircles the Silent Valley Reservoir's catchment area and crosses mountain summits, representing a significant feat of engineering. Castlewellan Castle, an ornate Scottish baronial castle built in 1858, offers a picturesque view over Castlewellan Lake. Lough Shannagh also has historical remnants, including abandoned stone cottage ruins and 'famine fields'.
The best time to visit the lakes around Slievenalargy generally depends on your preferred activities. Spring and summer (April to September) offer milder weather, longer daylight hours, and vibrant natural scenery, ideal for hiking, picnics, and water sports. Autumn brings beautiful foliage, while winter can offer dramatic, stark landscapes for experienced hikers, though conditions can be challenging.
While some mountain lakes like Blue Lough are popular for a refreshing dip after a hike, and Camlough Lake is known for hosting relay swimming events, it's important to exercise caution. Always be aware of water temperatures, currents, and local regulations. Swimming is generally not permitted in reservoirs like Silent Valley due to their function as water supply.
Many of the outdoor areas and trails around the lakes in the Mourne Mountains are dog-friendly, provided dogs are kept under control, especially around livestock or wildlife. For example, the Castlewellan Peace Maze and surrounding parkland are dog-friendly. Always check specific site rules, especially for nature reserves or managed parks like Silent Valley, where dogs may be restricted to certain areas or require leads.
Camlough Lake is a popular spot for water sports such as swimming, canoeing, and kayaking. For more detailed information on activities and facilities, you can visit the local tourism resources. You can find more details about activities at Camlough Lake on visitthingstodo.com.
Lough Shannagh, known as the 'Lake of the Foxes,' is a jewel corrie lake nestled in the heart of the Mourne Mountains. It offers a secluded and beautiful setting, perfect for those seeking solitude and stunning mountain views. A unique feature is the small gravel beach at its southern end, which, along with the surrounding historical remnants like abandoned stone cottage ruins, adds to its distinctive charm.
Silent Valley Reservoir is a significant man-made lake deep within the Mourne Mountains, built to supply water to County Down and Belfast. It's celebrated for its breathtaking scenery, combining impressive human engineering with natural beauty. The site includes the Ben Crom Reservoir and is encircled by the historic Mourne Wall, offering a peaceful and tranquil atmosphere for walking and picnicking.


Still not found your perfect lake around Slievenalargy? Check out the guides of these regions to see even more beautiful places.