Terra incognita
"Unknown land", area not mapped by cartographers / From Wikipedia, the free encyclopedia
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Terra incognita or terra ignota (Latin "unknown land"; incognita is stressed on its second syllable in Latin, but with variation in pronunciation in English) 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 (plural form), and some English maps may show Parts Unknown.
For other uses, see Terra incognita (disambiguation).
Similarly, uncharted or unknown seas would be labeled mare incognitum, Latin for "unknown sea".