not shown or located on a map; unexplored; unknown, as a place or region: the uncharted depths of space.

1840–50; un-1 + chart + -ed2

uncharted, unchartered.
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World English Dictionary
uncharted (ʌnˈtʃɑːtɪd)
(of a physical or nonphysical region or area) not yet mapped, surveyed, or investigated: uncharted waters; the uncharted depths of the mind

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Example sentences
But all this preliminary work has left the main field almost uncharted.
Unfortunately, it worked its way free and into some uncharted abyss.
As he headed into an uncharted expanse of rain forest, he left part of the
  expedition behind to await further supplies.
The brain is still quite uncharted more interesting than what areas are
  affected would be to know why.
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