View source for Sarn Badrig

{{Short description|Shingle reef in Cardigan Bay, Wales}}
{{Use dmy dates|date=April 2022}}
[[File:St Patricks Causeway-by-Ian-Warburton.jpg|right|thumb|Sarn Badrig 4 km from land]]
[[File:221052 ef956d8e-by-Ian-Warburton.jpg|right|thumb|Visible at very low [[spring tide]]]]
'''Sarn Badrig''', also spelled ''Sarn Padrig'' ([[Welsh language|Welsh]] for '[[St. Patrick]]'s causeway'), is one of several more or less parallel shingle reefs extending under the sea in [[Cardigan Bay]] on the west coast of [[Wales]]. The causeway is made of [[Till|glacial deposits]] left by receding ice sheets at the end of the last [[ice age]].

Sarn Badrig is the longest and most northerly of these, and extends south-westwards under the sea from [[Mochras|Mochras Point]], near [[Harlech]], parallel to the [[Llŷn Peninsula]] for a length of about 20&nbsp;km, and can be seen at low tide. It is a hazard to shipping.

A neighbouring causeway is that of [[Sarn y Bwch]], which is close to [[Tywyn]].

Another example can be found at [[Sarn Gynfelyn]], which is north of [[Aberystwyth]].

In Welsh legend it is one of the dykes which protected the drowned realm of [[Cantre'r Gwaelod]].

==Points of interest==

{{PoIgb start|type=collapsed}}
{{PoIgb|Bell buoy marking western hazard|52.68631|-4.4225|SH36271263||name=Bell buoy marking western hazard}}
{{PoIgb|-5m depth western point|52.69112|-4.36283|SH40321303|approx (from marine chart)|name=-5m depth western point}}
{{PoIgb|0m depth western point|52.70307|-4.33841|SH42021431|approx|name=0m depth western point}}
{{PoIgb|Mid point of visible sarn|52.74054|-4.24303|SH48591827|approx|name=Mid point of visible sarn}}
{{PoIgb|Eastern point of visible sarn|52.78167|-4.16098|SH54262268|approx|name=Eastern point of visible sarn}}
{{PoIgb|Landing at eastern end|52.80812|-4.15148|SH54992560|approx|name=Landing at eastern end}}
{{PoIgb end}}

==External links==
{{geoGroup}}
*[http://website.lineone.net/~dyfival1/histcant.htm Cantre'r Gwaelod (The Lowland Hundred)]
*[https://web.archive.org/web/20040706195431/http://www.llyn.info/sea-and-sand/sarn_badrig.htm Sarn Badrig - St. Patrick's Causeway]
*[https://www.geograph.org.uk/search.php?i=3530390 www.geograph.co.uk : photos of Sarn Badrig]

{{coord|52.7405|-4.2430|type:landmark_region:GB|display=title}}

[[Category:Reefs of Gwynedd]]
[[Category:Cardigan Bay]]
[[Category:Reefs of the Atlantic Ocean]]


{{Gwynedd-geo-stub}}