Swellies

The Swellies or Swillies (Welsh: Pwll Ceris) is a stretch of the Menai Strait in North Wales.

[1][2] It is notable for its difficulty in safely navigating its shoals and rocks due to the whirlpools and surges that are the result of the tides washing around the island of Anglesey at different speeds.

Swellies is the most treacherous section of the Menai Strait.

A medieval document quoted in the 2003 book The Menai Strait (translated from the 2003 Welsh original Y Fenai [cy]) by Gwyn Pari Huws and Terry Beggs (Gwasg Gomer Press) states: "In that arm of the see that departeth between this island Mon and North Wales is a swelowe that draweth to schippes that seileth and sweloweth hem yn, as doth Scylla and Charybdis – therefore we may nouzt seile by this swalowe but slily at the full see."

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The infamous Swellies. The hazards of this crossing were the driving force which led to the creation of Telford 's suspension bridge
The Swellies from the Belgian Promenade