Walking Britain graphic

Snowdonia Walk
The Welsh Three-Thousanders

Outline Route Map Walk Grading

Nat Park - Snowdonia - Challenge Route

County/Area - Gwynedd & Conwy

Author - Lou Johnson

Length - 31.5 miles / 51.2 km

Ascent - 11900 feet / 3606 metres

Grade - severe

Start - OS grid reference SH647555
Lat 53.079533 // Long -4.021304
Postcode LL55 4NU (approx. location only)

Walk Route Description

Photo from the walk - The Welsh Three-Thousanders 
Click thumbnails for larger images.

This is one of the great endurance walks of Snowdonia. It is not for novices and should only be attempted if you are fit, competent and able to navigate in poor visibility. The route can be subject to rapid changes in weather and what might be a nice day when you start could soon become a nightmare. Whatever the circumstances always be prepared to abort and admit defeat.

For most people completing 50 km on flat, easy surfaces will be a challenge. To complete the same distance over tough mountain terrain including ascending (and descending) a height equivalent to a third of Everest then you have put the route into context and perhaps immediately decided to leave it until another year! There are some sections where speed is impossible and this is compounded when tiredness starts to take over.

There have been many theories put forward about the route and the one given here begins at Pen-y-pass and finishes at Aber Falls. Obviously there are many ways this can be completed and the route provided here is based on personal preference and includes the hardest sections in the first two thirds of the route. However do not underestimate the final third as you are crossing remote areas far from major roads with any problems increased by fatigue.

At this stage it would be best to define the peaks in order of appearance. They are :-

 PeakHeight ftHeight m
1Crib Goch 3028923
2Garnedd Ugain34941065
3Snowdon (Yr Wyddfa) 35601085
4Elidir Fawr 3031924
5Y Garn 3106 947
6 Glyder Fawr 3277 999
7 Glyder Fach 3261 994
8 Tryfan 3002 915
9 Pen yr Ole Wen 3208 978
10 Carnedd Dafydd 3425 1044
11 Carnedd Llewelyn 3490 1064
12 Yr Elen 3156 962
13 Foel Grach 3202 976
14 Garnedd Uchaf 3038 926
15 Foel-fras 3090 942

The fittest will complete this route during the hours of daylight in summer but for those less used to walking then completion in two or three convenient sections spread over a couple of days would be more appropriate.

Much of the route is covered in the walks contained on this website so the broad outline given below should suffice :-

A - Starting from Pen-y-pass follow walk 3036 and descend from Snowdon towards Llanberis as far as Derlwyn (grid ref. 589588) before dropping down to the main road west of Nant Peris. This is "off path" and care needs to be taken to keep away from crags. If in doubt head down to Llanberis and walk up the road.

B - Locate the lane by the Chapel in Nant Peris (grid ref. SH605585) and follow the path into Cwm Dudodyn. Reaching a footbridge (grid ref. SH608596) strike off due north for the summit of Elidir Fawr. This ascent is one of the least interesting of the route and is a real test of character. From Elidir Fawr the onward route to Tryfan is straightforward with the descent from Glyder Fach best accomplished down the steep scree path just to the west of Bristly Ridge. Care also needs to be taken in locating the descent route down the north ridge of Tryfan. If in doubt retrace your steps to Bwlch tryfan ans use the Heather Terrace. Parts of this section are covered in walk 3019, walk 1186, walk 1088 and walk 3001 although most of them have been described in reverse order!

C - Having completed the descent from Tryfan attack Pen yr Ole Wen by the west ridge as described in walk 1150, which takes you through to Carnedd Llewellyn. The next summit, Yr Elen, is and an out and back route from Carnedd Llewellyn before you regain the main ridge and head north to Foel Grach. The remainder of the route from here to the Aber Falls car park is covered in walk 3021.

D - Give yourself a pat on the back!

 
Go to full list of Snowdonia Walks

 
Maps   Ordnance Survey Logo   Anquet Maps Logo

Ordnance Survey Explorer OL17Sheet Map1:25kBUY MAP
Anquet OS Explorer OL17Digital Map1:25kBUY MAP
Ordnance Survey Landranger 115Sheet Map1:50kBUY MAP
Anquet OS Landranger 115Digital Map1:50kBUY MAP

It is recommended you take a map. The preferred scale is 1:25k.

Printer Friendly Page

For an easy to print version of this walk description and outline map Click Here

OS Map showing start

Ordnance Survey Map showing starting point of walk - Click Here

GPX File

Download GPX File

Right click or option-click the link and choose "Save As..." to download this file.

You can also view the route of this GPX file on Google Maps by following this link to the Online GPX Viewer by Tom Hallam which is hosted on an external website.

Recommended Reading

Cicerone Books

Cicerone PressCicerone Press offer a range of books and eBooks offering guides to all the popular walking areas and long-distance trails in Britain and overseas. Their illustrated guides feature walks, information and maps to help you make the most of the outdoors.
Explore Cicerone's Catalogue


Recommended Cottage Holidays

Sykes Cottages

Over 7,000 personally inspected holiday cottages. In fact, we think we've got the finest selection in some of the UK and Ireland's most beautiful places.

Social Media

Follow Walking Britain for the latest news.

the people's poncho 2.0

Lightweight, stylish and lightweight alternative to traditional waterproofs ideal for walkers. More info.

Mountain Weather

Stay safe on the mountains. Use the Met Office specialist reports or their iOS or Android Apps (here & here) which offer detailed forecasts for most mountain areas in the United Kingdom.

New to Walking?

Click for a simple guide of how to start walking. Includes a guide on how to select your walks.