DL says: The medieval Biggar Dyke was built in the 13th century as a sea defence (which is still in use - and regarded as essential today) for the monks of Furness Abbey. It was originally maintained by the villagers of the various settlements on Walney as part of their duty as monastic tenants.
(To save this picture as Windows Wallpaper - right click it -
then select "Set as Background") (or click the above image to see the full sized version)