What tournament location has south korea as the country?
CREATE TABLE "winners" (
  "year" real,
  "dates" text,
  "champion" text,
  "country" text,
  "winning_score" text,
  "to_par" text,
  "margin_of_victory" text,
  "tournament_location" text,
  "purse" text,
  "winner_s_share" text
);
SELECT "tournament_location" FROM "winners" WHERE "country"='south korea';