SOURCE
All CIA World Factbooks 18 December 2003 to 18 December 2008

DEFINITION
The major ports and harbors selected on the basis of overall importance to each country. This is determined by evaluating a number of factors (e.g., dollar value of goods handled, gross tonnage, facilities, and military significance).

DEFINITION: The major ports and harbors selected on the basis of overall importance to each country. This is determined by evaluating a number of factors (e.g., dollar value of goods handled, gross tonnage, facilities, and military significance).

SOURCE: All CIA World Factbooks 18 December 2003 to 18 December 2008 via NationMaster