terra incognita
NounWordNet 3.0
Noun (1)
- an unknown and unexplored region“they came like angels out the unknown”Synonyms: unknownunknown regionterra incognita
Webster's Dictionary (GCIDE)
Terra incognita \Ter"ra in*cog"ni*ta\ [L.] An unknown land; unexplored country.
The enormous tracts lying outside China proper, still almost terrae incognitae. --A. R. Colquhoun. [Webster 1913 Suppl.]