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River confluence at Craig-y-nos Country Park

Just under the bridge that leads from the car park into the main park, these two rivers join. The one on the right is the Tawe on its way from Llyn-y-Fan Fawr to Swansea. A local map in the car park names the one on the left as the river Llynfell. This is where it ends after a very short run out from below Dan-yr-Ogof caves across the road.
Curiously there is a whole different valley called Cwm Llynfell with a separate Nant Llynfell about 10km west of here, also starting in the national park.