I am somewhere on the surface of the earth I walk 10 miles south, 10 miles west, and 10 miles north. I´m exactly back where I started. Where am I?
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Ignore the labelling. The shape is carved out of the earth, such that the blade starts from North Pole, moving Southwards, and then Westwards, and Finally northwards again to reach North Pole
Image credit:http://www.bbc.co.uk