Llyn Ogwen
Llyn Ogwen: A Rugged Mountain Lake in the Heart of Snowdonia
Llyn Ogwen is a dramatic glacial lake located between the towering peaks of Tryfan and the Carneddau, in the heart of Snowdonia National Park. Positioned at an elevation of around 310 metres, it stretches approximately 1.6 km in length and is framed by some of the most iconic mountains in Wales. Its rugged setting, steep-sided slopes, and crystal-clear waters make Llyn Ogwen a favourite for hikers, climbers, and nature lovers.
A Legendary Lake Beneath Snowdonia’s Peaks
Llyn Ogwen’s location at the foot of Tryfan and the Glyderau makes it an ideal base for mountain adventures. The lake itself is renowned for its dark, reflective waters and the dramatic skyline formed by the surrounding peaks. Whether you’re tackling the steep paths up Tryfan or wandering along the shore, the lake’s wild atmosphere is captivating. Legend has it that Llyn Ogwen is the final resting place of King Arthur’s sword, Excalibur, adding a mythical allure to its natural beauty.
© Brad Carr
Walks & Hikes Around Llyn Ogwen
Llyn Ogwen is surrounded by some of Snowdonia’s most iconic peaks and ridges, offering everything from family-friendly lakeside walks to thrilling mountain scrambles.
Book a Guided Hike on Tryfan
Tryfan North Ridge
- 3 mi
- 3 hrs - 4 hrs
A classic Snowdonia adventure up Tryfan’s iconic rocky spine. Hands-on scrambling, big exposure, and epic views.
Llyn Ogwen Shore Walk
- 2.5 mi
- 1 hrs - 1.5 hrs
A gentle walk around the lake’s edge with views of Tryfan, Glyderau, and the valley. Perfect for families or a short stroll.
Glyder Fach & Glyder Fawr via Bristly Ridge
- 6.5 mi
- 5 hrs - 6 hrs
A technical route with steep scrambles and incredible rock formations, including Castell y Gwynt and the Cantilever Stone.
Cwm Idwal Circular
- 3 mi
- 2 hrs
A popular loop around Cwm Idwal’s glacial lake. Ideal for those who want mountain views with less strenuous climbing.
Y Garn via Devil’s Kitchen
- 5.5 mi
- 4 hrs - 5 hrs
Climb through the steep Devil’s Kitchen path before reaching the summit of Y Garn, offering panoramic views over the Glyderau.
What to Know Before You Go
Llyn Ogwen’s location makes it susceptible to rapid weather changes, so always carry appropriate gear, including waterproofs and sturdy boots. If you plan to hike Tryfan or the Glyderau, ensure you have navigation equipment and experience with scrambling. The lake itself is not recommended for swimming due to its cold, deep waters.
Why We Love Llyn Ogwen
Llyn Ogwen is more than just a beautiful lake, it’s a gateway to some of Snowdonia’s most rugged and legendary landscapes. Whether you’re scaling the jagged peaks of Tryfan or soaking in the tranquil beauty of Cwm Idwal, the area’s wild, untamed character makes every visit memorable. The combination of challenging mountain terrain and accessible lakeside walks ensures something for everyone, from seasoned adventurers to casual visitors.
How to Get to Llyn Ogwen
Llyn Ogwen is located along the A5 between Capel Curig and Bethesda (postcode: LL57 3LZ). There is parking available at Ogwen Cottage, though spaces fill up quickly, especially on weekends. Public buses from Bangor and Betws-y-Coed stop at Ogwen Cottage, making it accessible without a car.
A Bit of Llyn Ogwen History
Llyn Ogwen’s glacial origins date back to the last Ice Age, carving out the rugged valley that cradles the lake. The area has long been associated with Arthurian legend, particularly the story of Excalibur’s final resting place. The surrounding mountains have been a playground for mountaineers for over a century, with the famous rock climbs on Tryfan attracting climbers from all over the world.
Keep exploring
Llyn Ogwen is just one of Snowdonia’s captivating mountain lakes. Ready to discover more? Check out our guides to nearby peaks and valleys!