An area or subject that has not been explored, mapped, or thoroughly studied yet.
From 'un-' (not) plus 'charted' (mapped or recorded). Became common in the age of exploration (1400s-1600s) to describe unknown territories.
Even today, we haven't mapped the entire ocean floor—so 'uncharted' territory still exists on Earth! About 95% of our oceans remain unexplored, full of unknown species.
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