Sarn y Bwch, (

Welsh Welsh may refer to: Related to Wales * Welsh, referring or related to Wales * Welsh language, a Brittonic Celtic language spoken in Wales * Welsh people People * Welsh (surname) * Sometimes used as a synonym for the ancient Britons (Celtic peopl ...

for 'buck's causeway'), is one of three parallel reefs extending beneath the sea into

Cardigan Bay Cardigan Bay ( cy, Bae Ceredigion) is a large inlet of the Irish Sea, indenting the west coast of Wales between Bardsey Island, Gwynedd in the north, and Strumble Head, Pembrokeshire at its southern end. It is the largest bay in Wales. Geo ...

from the west coast of

Wales Wales ( cy, Cymru ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by England to the Wales–England border, east, the Irish Sea to the north and west, the Celtic Sea to the south west and the ...

. The causeway, probably a medial moraine is made of glacial deposits left by receding ice sheets at the end of the last

ice age An ice age is a long period of reduction in the temperature of Earth's surface and atmosphere, resulting in the presence or expansion of continental and polar ice sheets and alpine glaciers. Earth's climate alternates between ice ages and gre ...

. It is sometimes called ''Sarn y Bwlch'' ('the causeway of the pass'), but this form is later and less common than ''Sarn y Bwch''. Sarn y Bwch is the central of the three, extending south-westwards from near

Tywyn Tywyn (Welsh language, Welsh: ; in English language, English often ), formerly spelled Towyn, is a town, community (Wales), community, and seaside resort on the Cardigan Bay coast of southern Gwynedd, Wales. It was previously in the histo ...

. To the north is the causeway of Sarn Badrig, whilst to the south is Sarn Gynfelyn, which extends from near Aberystwyth.

External links

Cantre'r Gwaelod (The Lowland Hundred)
Reefs of Gwynedd Cardigan Bay Reefs of the Atlantic Ocean {{Gwynedd-geo-stub