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Porth-yr-Ogof, Brecknockshire
The great cavern of Porth-yr-Ogof, through which the river Mellte runs, fascinated Thomas Hornor in 1816-20 and William Weston Young in 1835. In his 'Guide to the beauties of Glyn Neath' the latter observed '...this is a remarkable object; for although openings or caves in the limestone rock may be said to abound in this vicinity, there is not another in the valley of so large dimensions; you have light enough from the entrance to go a considerable distance.'
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