Since approximately 1988 three newer routes have been proposed for the project by the Japan–Korea Tunnel Research Institute Society (founded by the Korean Unification Church), with all three having the most eastern point terminating at Karatsu, Saga Prefecture, on the Japanese island of Kyūshū.[1] The proposed western termination points are in the Korean port city of Busan (부산광역시) for one of the routes, and the city of Geoje (거제시) for the other two routes, with all three routes running across the strait islands of Tsushima and Iki.[11] Combined tunnel-island traverses for the three routes range from 209 to 231 kilometers to cross the Korea Strait (both the eastern Tsushima Kaikyō and the western Busan Strait).