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On a small island in mudflats at the SW end of Coney Island in the Fergus Estuary. A small circular enclosure (diam. c. 7m) defined by a stone wall is visible only on Digital Globe (2011-2013). Noted by Hugh Carey. The area was not under water when depicted on the OS 6-inch maps. The modern field system in a 200 sq metre area adjacent to the enclosure is now regularly submerged.
Compiled by: Mary Tunney
Date of upload: 25 November 2025
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