The document discusses the outlook for liner traffic between the Northern Baltic Sea ports of Stockholm, Tallinn, Helsinki, Turku, and Naantali (the PENTA ports) in 2020 based on a project. Maritime transport represents over 15% of global cargo traffic and is predicted to increase over 100% in the future for the Baltic Sea area, where there are currently over 2000 ships. Each PENTA port plays a key role in cargo and passenger accessibility for the Central Baltic Region. In general, the outlook is positive for increased traffic flows between the PENTA ports by 2020, with transported units growing faster than transported volume. Passenger traffic is also expected to rise.