1. East China Sea, South Korea--Japan Ose-zaki to Cheju-do Yale Public content 1995. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. United States. Defense Mapping Agency. The Agency ; NOAA Distribution Branch, N/CG33, National Ocean Service, distributor. English. Public. East China Sea, Cheju Strait (Korea), and Korea Strait.