If it relates to transportation of goods from one port to the other, "interport" is the word:
The anomaly of separating intra-port transportation from interport transportation would be eliminated. The Secretary has authority under the bonded carrier and cartage statutes to determine the eligibility of applicants for either category.

Today, the local government attaches the same importance to marine tourism as to marine fishery and inter-port transportation.

What is cabotage?

Cabotage is the trade or transport of cargo in coastal waters between two points within a country. U.S. cabotage laws are referred to as the Jones Act. Many nations, like the U.S., have cabotage laws which require domestic owned vessels to perform domestic interport water transportation service.

Dizionario Ragazzini 2003

A freight village is a defined area within which all activities relating to transport, logistics and the distribution of goods, both for national and international transit, are carried out by various operators.
http://www.freight-village.com/

--------------------------------------------------
Note added at 14 mins (2005-07-06 18:35:05 GMT)
--------------------------------------------------

also called LOGISTIC CENTRE:
from Eurostat
http://forum.europa.eu.int/irc/dsis/coded/info/data/coded/en...