Most people pass through landscapes like this without realising the tidal foreshore has been put to work for centuries, and this particular structure is a quiet example of just that.

The weir is post-medieval in date and takes the form of a V-shape, a design that exploited the movement of the tides to trap fish rather than requiring continuous human effort. The basic principle is straightforward: two lines of fencing, angled to funnel fish inward, would catch and hold whatever the retreating tide left behind. Here, the flood fence runs east to west and stretches some 23 metres, while the longer shore fence, oriented northwest to southeast, runs to 63 metres. Both were constructed from wood set into the tidal clays at the low water mark, west of Inishbonane or Tradree Point, adjacent to Clonmoney South townland. The structure was recorded in February 1997 by Aidan O'Sullivan, whose survey of intertidal archaeological sites along the Shannon estuary brought structures like this one into the scholarly record.