Karatsu
A small castle town on the Genkai Sea, known for pottery and an autumn festival.
The name 唐津 reads as “the port to the continent” — kara here is the mainland at large rather than any one dynasty, and the harbour was named for its outward traffic rather than for itself; it faces the Korean peninsula across the Genkai Sea. Karatsu ware already existed in the 1580s, built on Korean-derived technique, and the potters carried back to Kyūshū during Hideyoshi's invasions of the 1590s vastly expanded it; Hagi ware, on the Japan Sea coast, was founded outright by Korean potters brought from the same campaigns. The old ranking of tea wares runs ichi Raku, ni Hagi, san Karatsu — and the second and third both rest on Korean potters and Korean technique. The aesthetic most often described to guests as quintessentially Japanese carries a Korean lineage that the ranking itself records and the tour script omits.
A ship calling at both Karatsu and Busan is sailing one story, not two. That is a route theme, and at present nobody is using it.