A pair of walls arranged in a V‐shaped pattern within the intertidal zone of a gently sloping foreshore with the pointed end at the seaward end. Built of stone or hurdlework, the walls may be up to 200 m long. A narrow gap of about 1 m is left at the point where the walls meet and here a net or fish‐trap will be placed when the structure is in use. Built from prehistoric times onwards, these weirs work in a simple but highly effective way. At high tide the weirs flood, but as the tide goes out any fish within the area defined by the weirs are naturally channelled towards the traps placed at the junction of the two walls. When the tide is fully out the owner of the weir simply walks down the foreshore and takes the catch from the traps.