Washed up on the shore between McArthur’s Head and Proaig, Isle of Islay

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Picture of a broken water level board washed up on a remote shoreI’m not sure what this once was, I’m guessing some kind of tide or water level indicator. We found it while walking at the bottom of the cliffs between McArthur’s Head and Proaig in the south east of Islay in April 2009.