The hill in the distance with the mast is Corn Hill with its cairns. I’d be more convinced by this stone row were it aligned onto the hill, but prehistory doesn’t always fit into what you want.
Image credit: ryaner
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Local legend has it that rebel soldiers from the 1798 rebellion were chased from Ballinamuck to around here where they were killed. These stone supposedly indicate their final resting places.
Yes, I've heard that story. I'm unconvinced that it's prehistoric.