The adjacent Nant-y-Llyn, outflow of the Llyn y Fan Fawr, is ‘lively’, to say the least. The siting of a cairn near the confluence with the nascent Afon Tawe is noteworthy. In my opinion.
Image credit: Robert Gladstone
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I agree, there's way too many cairns-near-water-sources in that area to be coincidence. Great shot too.
As you'll know that is one of the smallest cascades, too.
I really must get back to Y Mynydd Du. Just needs a very early start (and I'm lazy).