関門海峡
In high school baseball jargon, when a team from Kyūshū wins a tournament. The first to "cross the Kanmon Straits" was Kokura Secondary in the 1947 Summer Kōshien. Coincidentally, Kokura Secondary repeated as champions in 1948, a feat not matched until Komadai Tomakomai also became the first team to bring the title to their region then repeated the following year.