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I've removed a reference to the nearby Green Hill being taller, as there seems to be no evidence for it - in fact, there's evidence against it.
An amateur website claims Green Hill as the county top, at a height of 628 m tall, but no reputable supporting evidence is offered, and the Ordnance Survey confirms otherwise (see the 1:25,000 map; I don't seem to be able to link to it myself - sorry), stating the true height as 626 m asl. Ministry (talk) 18:49, 29 December 2014 (UTC)[reply]
OS maps clearly show that Gragareth is 627m AOD [1], whereas Green Hill is 628m AOD [2]. (You may need to zoom out one level on the maps on the Streetmap site to see the 1:25k OS mapping.) OS is of course an authoritative, relable source. Bazonka (talk) 19:36, 14 June 2020 (UTC)[reply]