ter·ra in·cog·ni·ta /ˈtɛrəˌɪnˌkɑgˈnitə, ɪnˈkɑgnətə/
Ter·ra in·cog·ni·ta An unknown land; unexplored country.
The enormous tracts lying outside China proper, still almost terrae incognitae. --A. R. Colquhoun.
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terra incognita
n : an unknown and unexplored region; "they came like angels out
the unknown" [syn: unknown, unknown region]