How many letters does the top answer for “city in south gyeongsang” have?

The most common answer is ulsan (5 letters).

Crossword clue: city in south gyeongsang

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

ulsan 5 letters wd-fact-v3

city in south africa 50% similar → bloemfontein, durban, eastlondon

city in south australia 50% similar → mountgambier, portaugusta, whyalla

city in south holland 50% similar → dordrecht, leiden, maassluis

city in south karelia 50% similar → lappeenranta

city in south kivu 50% similar → uvira

city in south korea 50% similar → ansan, anyang, busan

city in south ossetia 50% similar → tskhinval

city in south ostrobothnia 50% similar → seinajoki