terra incognita

Latin: terra, land; incognita, unknown.

terra incognita

1. Land that has never been explored or mapped; uncharted territory.
2. By extension, ideas or concepts that have not yet been tried or explored.
   • 2009, Gary Clark, Quadrant, November 2009, No. 461 (Volume LIII, Number 11), Quadrant Magazine Limited, page 9:

     The concept of the unconscious or an inner terra incognita, an unknown country of the psyche that precedes and predicates the Cartesian subject, the focal point of rational consciousness, was a revolutionary idea.

• incognition
• virgin territory