Best lakes in the Wicklow Mountains National Park are characterized by their diverse origins and scenic surroundings. The park features glacial lakes, man-made reservoirs, and natural bodies of water nestled within mountain valleys. Many lakes are associated with historical sites, such as the Glendalough monastic settlement. The landscape offers a variety of natural features for exploration.
Last updated: November 9, 2026
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The Upper Reservoir is the highest lake in the Glenasmole valley and feels a lot wilder and more remote than its lower neighbour. At this point on the south-eastern shore, you are riding deep into the heart of the catchment area, where the wooded slopes of the Dublin Mountains seem to drop straight into the deep, dark water.
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A spectacular hike that quickly takes you high above the Glendalough Valley. After about an hour, you'll find yourself standing 300m directly above the Upper Lake on an almost vertical cliff: extraordinary! First, it's a relatively steep climb through the forest on beautiful hiking trails, then you work your way uphill, then a section straight along the ridge of the Spinc, with fantastic views of the lakes repeatedly offered. It's breathtaking! At the end of the climb, you climb up again on wooden planks - very comfortable. Then it's a leisurely descent on wooden planks to the Glenealo River. You cross this at a bridge, then descend relatively steeply along the river. The last part of the hike leads very comfortably directly along the shore of the Upper Lake back to the parking lot. Our recommendations: - Be sure to do this hike during the week. The hiking trails in the Glendalough Valley are really crowded on weekends. - Hike the trail clockwise. This way, you'll get to the top faster and have a very pleasant second part. We found this to be ideal. - Next to the boardwalk right after the summit, a whole herd of deer including babies <3 was lying in the grass, just 5 meters from the hiking trail! - It only took us 2:30 hours to complete the entire route, but that was obviously relatively quick. - You need good hiking shoes, especially for the descending part along the Glenealo river.
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The walkway along the Poulanass waterfall is beautifully laid out and easy to walk on even for inexperienced people.
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The forest section and Poulanass Waterfall on the Glendalough Loop offer a tranquil retreat into nature's embrace, with lush greenery and the soothing sound of cascading water creating a serene ambiance.
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Gleann Dá Loch, nestled along the Wicklow Way, is a captivating valley that enchants hikers with its pristine beauty. The name itself, translating to "Valley of the Two Lakes" in Irish, hints at the scenic wonders that unfold within this natural haven. As you traverse the Wicklow Way through Gleann Dá Loch, the landscape transitions between lush greenery, rolling hills, and the serene presence of two shimmering lakes. The trail meanders through this picturesque valley, offering breathtaking views of the surrounding mountains and the reflective waters below.
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There are signs everywhere that bathing is forbidden... The water is also pretty black from the moor.
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Good circular route, thick planks with nails prevent sinking in the peat/bog and steel nails in the planks prevent slipping in wet weather.
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The Wicklow Mountains National Park boasts several lakes with distinctive natural features. Upper Lake, Glendalough, is a glacial lake known for its deep blue waters reflecting the surrounding mountains. Lough Ouler, often called 'Ireland's heart-shaped lake,' is a beautiful glacial lake on Tonelagee mountain. Lough Tay, or 'Guinness Lake,' is famous for its dark waters and white sandy shoreline, resembling a pint of stout.
Yes, several lakes offer family-friendly options. The Vartry Reservoir near Roundwood provides nearly 20 kilometers of easy walking trails suitable for families, with excellent views. The trails around Glendalough Lower Lake are also generally easier and accessible for a wider range of visitors.
The Glendalough Valley is particularly rich in history. The Upper Lake, Glendalough, is notable for its proximity to the historic Glendalough monastic site, founded by St. Kevin in the 6th century, making it a significant archaeological and spiritual site. The Triton Lake at Powerscourt Estate features a dramatic fountain inspired by Rome's Piazza Barberini and Pegasus statues, adding a touch of classical artistry.
The area around the lakes offers a variety of outdoor activities. You can find numerous hiking trails, such as those around Glendalough, including the popular Spinc Trail. For more options, explore the Waterfall hikes in the Wicklow Mountains National Park. Mountain biking is also popular, with trails like the Lough Tay – White Hill loop. Check out the MTB Trails in the Wicklow Mountains National Park for more details. Road cycling routes, such as the Sally Gap and Slieve Man loop, are also available; see the Road Cycling Routes in the Wicklow Mountains National Park guide.
For a more tranquil experience away from the busiest spots, consider visiting the Bohernabreena Upper Reservoir. It offers serene walks surrounded by trees with views of the Dublin Mountains, providing a peaceful retreat. The Vartry Reservoir also provides extensive trails that can be less crowded than Glendalough, especially on weekdays.
The best time to visit the lakes generally depends on your preferred activities. Spring and autumn offer pleasant temperatures and beautiful scenery with fewer crowds. Summer is ideal for longer days and warmer weather, though popular spots like Glendalough can be busy. Winter can be stunning with snow-capped peaks but requires appropriate gear for colder, potentially icy conditions on trails.
Many trails in the Wicklow Mountains National Park are dog-friendly, but it's important to keep dogs on a leash, especially in areas with livestock or wildlife. The Vartry Reservoir, for instance, is noted as suitable for walking or running with your dog.
For breathtaking views, the summits above Glendalough Upper Lake offer panoramic mountain vistas. Lough Ouler's heart shape is best appreciated from above, typically from the Tonelagee mountain trail. Lough Tay can be admired from several viewing points along the Sally Gap Drive, providing dramatic scenery often used for filming.
Yes, Glendalough is accessible by public transport. St. Kevin's Bus Service operates daily routes from Dublin city center directly to Glendalough, making it convenient for visitors without a car. It's advisable to check their schedule for current timings.
While some visitors do engage in wild swimming, it's important to exercise caution and be aware of local regulations and safety. The water in many of the glacial lakes can be very cold. Always prioritize safety, check water conditions, and be mindful of private land restrictions, such as at Lough Tay.
Visitors frequently praise the stunning natural beauty and tranquility of the lakes. Many appreciate the opportunity to relax by the water, explore the surrounding trails, and take in the panoramic mountain views. The historical significance of sites like Glendalough also adds a unique dimension to the experience, blending nature with heritage.
Yes, both the Bohernabreena Upper Reservoir and the Vartry Reservoir are crucial water sources. The Bohernabreena Upper Reservoir supplies water for the south of Dublin, while the Vartry Reservoir is a primary water source for Dublin city, formed by constructing a dam across the River Vartry in the 1860s.


Still not found your perfect lake in the Wicklow Mountains National Park? Check out the guides of these regions to see even more beautiful places.