The triangular shape of Pen Yr Ole Wen rises above the river Idwal in the Ogwen Valley, Snowdonia. Image © Stephen Spraggon.

Pythagorean Geology

Snowdonia, Wales

I haven't climbed Pen Yr Ole Wen but I can imagine it being a slog as its southern route is an almost continuous 1 in 2 gradient. Its classic triangular shape makes it rather photogenic, particularly when viewed from neighbouring Cwm Idwal. I took this photo from the banks of the river Idwal as it flowed north towards Pen Yr Ole Wen. Despite the light being subdued I found plenty of colour in the dusk sky and the green moss growing on rocks in the river.

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