Llyn Brenig and Alwen Reservoir Walk – Two Lakes Trail  5/5 (1)

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Route Summary:

Long route around both Llyn Brenig and Alwen Reservoir. An ideal walk for a winter’s day – if the roads are open.

21.77 km 364 m 6 hours or so

Calculate the time using Naismith’s Rule and factor in your own pace.

Start and Finish: Alwen Reservoir


The Llyn Brenig Visitor Centre is on the route while the nearest pub is the The Sportsmans Arms – though we suggest giving them a ring to check if they’re open (were open at time of writing)


Remember that we cannot outline every single hazard on a walk – it’s up to you to be safe and competent. Read up on Mountain Safety , Navigation and what equipment you’ll need.

Public Transport: Traveline for UK Public Transport
Parking and Post Code for Sat Nav (where applicable): check the map

Parking at the start of the route

Weather Forecast:

Met Office Mountain Weather

Check out our Best Mountain Weather Forecast?

Llyn Brenig and Alwen Reservoir Walk – Two Lakes Trail Route Map and GPX Download

Download the GPX File

Recommended Maps


Summits and Places on this Route

No summits were found but here are a few nearby

Places Nearby:


Llyn Brenig and Alwen Reservoir Walk – Two Lakes Trail Details

The Two Lakes Trail in Mynydd Hiraethog takes you first around Alwen Reservoir (not to be confused with nearby Llyn Alwen!) before taking on the walk around Llyn Brenig. While the route looks reasonably flat, over the 21km it covers the ascent builds up to a not insignificant 400m or so. Those looking to just walk around Llyn Brenig rather than the full Two Lakes Trail, can view our Walk around Llyn Brenig post. Or for the Alwen Reservoir, read our description of the Alwen Reservoir Section here.

The route is also a great family cycle ride, with the trails all straightforward forestry tracks rather than a true mountain bike trail.

There’s the Llyn Brenig Visitor Centre to stop at on the way around – it’s well worth the small diversion.

Llyn Brenig and Alwen Reservoir Walk – Two Lakes Trail Route

Visit the route homepage here or print off the leaflet here.

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