The phrase "uncharted area" refers to a place or subject that is not well-known or explored. It represents a territory or field that is unfamiliar and has not been studied or mapped before. Full definition
It follows a team of explorers who venture into uncharted areas of the underground maze of bones, discovering dark secrets along the way. (thewrap.com)
But other artists are pushing conservation science into uncharted areas, with work fashioned from materials as diverse as soap and chocolate, blood and faeces (yes, some modern art really is crap). (newscientist.com)
Players will be able to explore uncharted areas and develop tactics in the midst of a storyline filled with twists and turns. (monstervine.com)