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terra incognita (n.)

"unknown or unexplored region," 1610s, Latin, literally "unknown land," from terra "earth" (from PIE root *ters- "to dry") + fem. of incognito.

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Definitions of terra incognita from WordNet

terra incognita (n.)
an unknown and unexplored region;
Synonyms: unknown / unknown region
From wordnet.princeton.edu