Britain's most ancient fishing trap has been discovered off the coastline of Wales after research carried out on Google Earth.
The 853ft (260m) long construction is thought to have been built 1,000 years ago, around the time of the Domesday Book, using large rocks placed on a river bed.
Scientists believe large numbers of people worked together to erect the trap and it allowed them to catch plentiful numbers of fish for their supper.
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