I took the photo from the bridge over the Afon Glaslyn when I did a Beddgelert and Cwm Bychan walk.
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Hugo, I did that walk about 20 years ago after camping out overnight in Cae Du just outside Beddgelert. The weather that day was beautiful and the views from Mynydd Sygun were brilliant in all directions. We took a small detour over to look down onto the village and then back down to Pont Aberglaslyn through Cwm Bychan. I was interested in the aerial tramway pylons which are still there from the time when they were used to carry the copper from the mines down to the railway. An added bonus then was that we could walk back to the campsite through the W.H.Railway tunnels which were not in use then. There was a huge puddle in the centre (and darkest part) of the longer tunnel and we didn't know how deep it would be as the floor was quite uneven but Mrs.Gwynant led the way!
There are some great pictures of the walk on
www.mywainwrights.co.uk>2009walks cwmbychan (4th July 2009) online by Gary Richardson, one of which features your photo of the waterwheel, and also of his journey up from Waunfawr on the WHR.