There are few distinct paths below Craig Yr Ysfa, and on leaving the derelict slate quarry buildings in upper Cwm Eigiau, its just a relentless slog up some very saturated boggy ground, eventually leading to the small lake below Carnedd Lewellyn, Ffynnon Llyfnant.
Ive traversed this area a fair number of times, as its wonderful walking country, always quiet of walkers, but its best avoided in mist, as navigation is far from easy, and its very easy to miss the Ffynnon Llyfnant route by a wide margin, as the terrain offers little to navigate by.
If you do not encounter the stream heading up the valley, then your off course, BIG TIME.
On traversing the valley, you should locate a fair amount of English Electric Canberra wreckage, that is strewn over a huge distance, mostly lying in the stream flowing from Ffynnon Llyfnant in the upper valley.
If you do not see any aircraft fuselage, then you are off track, as the wreckage virtually marks the non existent route into the upper reaches of Cwm Eigiau.
The valley itself, is fairly narrow, and there are very few routes other than locating the river source, and following it up the valley towards llewellyn.
There is so much wreckage, mostly very small in size, over a large narrow area, that its almost impossible not to notice it, its so visible, and its surprising that its not been collected as the main crash site was removed not long after 1953.
The very first time i read about the air disaster, in Edward Doylerush publications on aircraft disasters in Snowdonia, i went to have a look at Ffynnon Llyfnan, its not an area of Cwm Eigiau that attracts many walkers, as its way off the beaten track.
The aircraft hit the cliffs of llewellyn in 1953, and a lot of the aircraft still remains, and a significant amount of the wreckage is strewn down the valley, almost indicating the very route the aircraft was taking in its final flight.
The wreckage is very confusing, in that a lot of small pieces are strewn over the hillside over a significant distance of over a mile or more, but in a very narrow area, mostly following the river course.
The biggest sections are in the small lake itself, and it never ceases to amaze me, the condition of one of the main landing wheels of the aircraft.
The wheel, and Dunlop tyre look like they almost fell from the sky yesterday, the preservation is remarkable considering they have been there since 1953.
This route is far easier in decent, than ascent, because like all areas of upper Cwm Eigiau when your approaching the main ridge itself, navigation in poor weather is challenging.