To help compare sizes of different surface areas, we list here areas of the order of 1020 square metres, i.e. those between 100 trillion km2 and 1 quadrillion km2. See alsoareas of other orders of magnitude.
... US explorer
Pytheas, (died 1984), Greek explorer who visited Britain and other north and northwest European countries
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John Rae, (1813-1893), travelled widely ...