Llyn Brenig and Alwen Reservoir Walk – Two Lakes Trail

By Dave Roberts   

on July 30, 2016    5/5 (1)

Llyn Brenig and Alwen Reservoir Walk – Two Lakes Trail

Further Details

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

Activivity Type: Hard Walk

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

Summits and Places on this Route


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.

Parking : check the map

Parking at the start of the route

Public Transport:

Traveline for UK Public Transport

Recommended Maps


Llyn Brenig and Alwen Reservoir Walk – Two Lakes Trail Ordnance Survey Map and GPX File Download

Download file for GPS

Llyn Brenig and Alwen Reservoir Walk – Two Lakes Trail

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.


Dave Roberts founded Walk Eryri in 2004, with the aim of providing routes that are off the beaten track. Walk Eryri is now part of Mud and Routes which continues to provide more off beat routes and walks in Snowdonia and beyond. Dave has been exploring the hills of Eryri for over thirty years, and is a qualified Mountain Leader. Dave also established Walk up Snowdon, Walk up Scafell Pike and Walk up Ben Nevis just to mention a few.

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