Superior ports have a global shipping network but a restricted inland network. Most leading
shipping companies have a calling schedule to a superior port. In the case of superior port,
the weakness of legal schemes for backward areas indicates that only limited logistics
services can be supplied. Backward areas of superior ports are small and generally unable to
afford warehouse and logistics facilities for value-added service to shippers. The majority of
the cargo of these container ports is produced in its hinterland.