English: Llyn Cowlyd. With an area in excess of 100ha, Llyn Cowlyd is the deepest lake in Snowdonia. The Cwm and its lake were purchased by Colwyn Bay Council in 1891 and the lake enlarged by the building of a dam. Water is piped from the dam end to Colwyn Bay a distance of 18 miles. The reservoir, now owned by Dwr Cymru/Welsh Water, also supplies Conwy and Deganwy as well as the aluminium works at Dolgarrog.
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== {{int:filedesc}} == {{Information |description={{en|1=Llyn Cowlyd. With an area in excess of 100ha, Llyn Cowlyd is the deepest lake in Snowdonia. The Cwm and its lake were purchased by Colwyn Bay Council in 1891 and the lake enlarged by the building of