How many letters does the top answer for “(of unknown regions) not yet surveyed or investigated” have?

The most common answer is uncharted (9 letters).

Crossword clue: (of unknown regions) not yet surveyed or investigated

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

uncharted 9 letters wn-def

(of unknown regions) not yet surveyed or investigated

unmapped 8 letters wn-def

(of unknown regions) not yet surveyed or investigated