It means you are in land that hasn't been charted on the map.
Uncharted Territory - album - was created in 2011.
Uncharted Territory - novella - was created in 1994.
The islands were uncharted, so no one knew what to expect there. When he went on his first date, Bill was in uncharted territory.
the human mind
American Chopper The Series - 2003 Uncharted Territory was released on: USA: 1 October 2012
Knots Landing - 1979 Uncharted Territory 6-12 was released on: USA: 27 December 1984
Star Trek Enterprise - Uncharted Territory - 2013 was released on: USA: 20 August 2013 (Blu-ray premiere) Germany: 5 September 2013
If you mean the game uncharted it is not available on x-box, only PS3.
Discovered land is often referred to as new territory or uncharted territory, especially if it has not been previously explored or documented.
Outer space.
The outer space
do you mean Nathan Drake from uncharted