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About terra incognita
Terra incognita or terra ignota is a term used in cartography for regions that have not been mapped or documented. The expression is believed to be first seen in Ptolemy's Geography c. 150. The term was reintroduced in the 15th century from the rediscovery of Ptolemy's work during the Age of Discovery. The equivalent on French maps would be terres inconnues, and some English maps may show Parts Unknown. Similarly, uncharted or unknown seas would be labeled mare incognitum, Latin for "unknown sea".
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