The total volume of cargo relocated through a port in a given period of time and any movement of goods and/or passengers using merchant ships on journeys, which are undertaken wholly or partly at sea.

One port transport (movements of goods shipped to offshore installations, or for dumping at sea, or reclaimed from the sea bed and unloaded in ports) is included. While bunkers and stores supplied to vessels in port are excluded, bunker oil shipped to vessels offshore is included. Fluvio-maritime movements of goods by merchant ships are included. Movements of goods on inland waterways vessels between seaports and inland waterway ports are excluded (they are included in inland waterway transport). Movements of goods carried internally between different basins or docks of the same port are excluded.

• International sea cargo traffic