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TM5180 : Water gathered in field

taken 11 years ago, near to South Cove, Suffolk, Great Britain Water gathered in field
If anyone can give me a more technical term for these depressions (there must be one; they're clearly not natural) I'd love to hear it. 

TM5180, 22 images   (more nearby TM 5112 8063 [10m precision]
WGS84: 52:21.9676N 1:41.2334E TM 5119 8064
