How many letters does the top answer for “island in north korea” have?

The most common answer is sinmido (7 letters).

Crossword clue: island in north korea

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

sinmido 7 letters wd-fact-v3

yanggak 7 letters wd-fact-v3

a person from north korea 50% similar → northkorean

capital of north korea 50% similar → pyongyang

city in north korea 50% similar → nampo, pyongyang, rason

dish from north korea 50% similar → pyeonsu

lake in north korea 50% similar → heavenlake

mountain in north korea 50% similar → baekdumountain, chilbosan, mountkumgang