Large pond or small lake?
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Image: © Gordon Hatton Taken: 8 Aug 2020
This must also be a flooded former gravel quarry, but much smaller than those nearby. There are extensive areas of gravel extraction in this area and near to Bolton on Swale. I suspect the deposits are a remnant of the last ice age when the Stainmore glacier would have met other ice in this neighbourhood originating both from the direction of the North Sea and from Swaledale, thus leaving large deposits of moraine material including gravels.