terra incognita
terra incognita noun phr. [,tɛrǝ ɪn'kɒgnɪtǝ, ɪnkɒg'ni:tǝ]
زمین کشف نشده، قطعه زمین از گرو در نیامده
terra incognita noun phr. [,tɛrǝ ɪn'kɒgnɪtǝ, ɪnkɒg'ni:tǝ] E17.[Latin = unknown land.]An unknown or unexplored territory, land, or region;
fig. an unknown or unexplored area of study, knowledge, or experience. Freq. without article.
■ A. Briggs The historical landscape..looks at first like a terra incognita. New Scientist The largest region of geological terra incognita left on the global map. [TahlilGaran] English Dictionary ▲