How many letters does the top answer for “the southern peninsula of greece; dominated by sparta until the 4th century bc” have?

The most common answer is peloponnese (11 letters).

Crossword clue: the southern peninsula of greece; dominated by sparta until the 4th century bc

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

peloponnese 11 letters wn-def

the southern peninsula of Greece; dominated by Sparta until the 4th century BC

peloponnesus 12 letters wn-def

the southern peninsula of Greece; dominated by Sparta until the 4th century BC