The port of Thessaloníki is artificial and it consists of six wide piers, which are numbered from 1 to 6 from east to west, and intermediate quays. A detached breakwater about 1,000 m long protects the moles 1,2,3,4 and 5 from the waves caused by south winds. Ships can enter the port from either southeast or west.
The southeast entrance of the port is formed between the southeast end of the breakwater and the head of mole no. 1; it is open to the southeast and the width of its entrance is 183 meters. The west entrance to the port, which is open to the southwest, is formed between the west end of the breakwater and the eastern end of mole no. 5. The width of the entrance is 152 meters.