The number of listed Japanese islands is expected to more than double from 6,852 to 14,125 after the government recounted them for the first time in 35 years, according to a source familiar with the matter.

The huge increase resulting from improved accuracy with the digitalization of maps is unlikely to change the size of Japanese territory or territorial waters, the source told Kyodo News on Monday.

The government is expected to release the new figure as early as March, although the number could change as the Geospatial Information Authority of Japan, or GSI, is making final adjustments, the source said.