Llyn Peris
Llyn Peris: The Dramatic Lake at the Foot of Snowdon
Llyn Peris is a striking glacial lake located at the base of the Llanberis Pass, directly adjacent to the famous village of Llanberis. Nestled between rugged mountains and the historic remnants of the slate industry, Llyn Peris offers a captivating combination of natural beauty and industrial heritage. Its deep, dark waters and the towering peaks surrounding it make it one of Snowdonia’s most atmospheric spots.
Where Industry Meets Wilderness in the Heart of Snowdonia
Llyn Peris is flanked by steep slate-strewn slopes, with Snowdon and Elidir Fawr rising dramatically above. The lake itself is around 1.8 km long and was once much smaller before being enlarged as a reservoir for the Dinorwig Hydroelectric Power Station. The juxtaposition of natural wilderness and industrial remnants gives Llyn Peris a unique, almost haunting character. Despite its industrial use, the lake remains a scenic spot, popular for walking, photography, and exploring the rich history of the area.
© Brad Carr
Walks & Hikes Around Llyn Peris
Llyn Peris may be known for its industrial heritage, but the surrounding landscapes offer a range of hikes that blend natural beauty, history, and sweeping mountain views. Here are some great routes in the area:
Book a Guided Hike on Llyn Peris
Dinorwig Quarry & Llyn Peris Loop
- 3.5 mi
- 2 hrs - 3 hrs
Explore the eerie remains of Dinorwig Quarry above the lake, with views across Llyn Peris and Elidir Fawr. Ideal for photographers and history lovers.
Llanberis Path to Snowdon
- 9 mi
- 5 hrs - 6 hrs
Starts just beside Llyn Peris in Llanberis and ascends Snowdon’s most gradual route. Offers mountain and lake views along the entire path.
Elidir Fawr from Nant Peris
- 6 mi
- 4 hrs - 5 hrs
A tough but rewarding mountain walk starting at the southern end of Llyn Peris. Expect steep climbs and breathtaking ridge views.
Llyn Peris Lakeside Path
- 2 mi
- 1 hr
Crib Goch is an exposed, knife-edge ridge for confident scramblers, thrilling, technical, and not for the faint-hearted.
Vivian Quarry & Llanberis Circular
- 4 mi
- 2 hrs - 2.5 hrs
Begin in Llanberis, passing Vivian Quarry and skirting parts of Llyn Peris. A great introduction to the area’s industrial past and natural beauty.
What to Know Before You Go
While swimming is not recommended due to the lake’s use as a reservoir, Llyn Peris is perfect for lakeside walks and enjoying the rugged scenery. The weather can change rapidly due to the surrounding mountains, so dress appropriately and carry a waterproof jacket. The area around the lake can be steep and slippery, especially near the slate heaps.
Why We Love Llyn Peris
Llyn Peris embodies the raw, untamed spirit of Snowdonia. Its dark waters, framed by the remnants of the slate industry and the towering mountains, create a dramatic and almost eerie atmosphere. The contrast between natural beauty and industrial heritage makes it a fascinating destination for anyone exploring the Llanberis area.
How to Get to Llyn Peris
Llanberis (postcode: LL55 4UR) is the main access point for Llyn Peris. The lake is located right by the main road (A4086) through the village. Parking is available at the Electric Mountain Visitor Centre and near the Slate Museum. Buses from Caernarfon and Bangor also stop in Llanberis, making it easily accessible by public transport.
A Bit of Llyn Peris History
Historically, Llyn Peris was a natural glacial lake before being transformed into a reservoir as part of the Dinorwig Power Station project in the late 20th century. Named after Saint Peris, a legendary hermit associated with the area, the lake has a deep connection to both local folklore and the industrial history that reshaped Snowdonia’s landscape.
Keep exploring
Llyn Peris is just one of the many dramatic lakes in Snowdonia. Ready to see more? Check out our guides to nearby peaks and waterside adventures!