Geographers say the number of islands in Japan is expected to more than double after a recount of its islands, Kyodo News reported. A total of 7,000 more islands Japan didn't know existed were found through digital mapping by the Geospatial Information Authority of Japan (GSI). The agency used advanced technology cross-referenced with past aerial photos to conduct the recount. The discovery is expected to raise the nation’s number of islands, which is based on a 1987 Japan Coast Guard study, from 6,852 islands to 14,125, Kyodo News reported.