|Central International Port
||Especially important ports of the major ports, serving as the bases of the overseas marine transport network.
||Ports serving as the bases of overseas or domestic marine transport network.
||Ports, other than major ports, mainly committing to local interests.
|Port of Refuge
||Ports mainly serving as shelters for mooring small ships from storms.
||The airport that serves as the base for the international air transportation network or the domestic air transportation network.
|Local Management Airport
||Airports important in forming an international air transportation network or a domestic air transportation network.
||Airports provided by the Self-Defense Forces and designated to be allowed to share with private airliners.