How to reach the port of Helsinki
There are 3 terminals to the ferry port of Helsinki.

Helsinki Olympia terminal (South)
Is used for ferries in the direction of Stockholm: Olympia terminal is about 1.8 km from the Centre of Helsinki, 179 Km from Tampere and 166 from Turku. From Tampere to Helsinki and Turku take E12 E18.

Helsinki West Terminal
Used for the ferry to Tallinn, the West terminal is located approximately 2.4 Km from the Centre of Helsinki, 179 km from Tampere and 166 Km from Turku. From Tampere prenid the E12 towards Helsinki and from Turku E18.

Helsinki Vuosaari, Hansa Terminal (East)
Used for ferries to Rostock, the Hansa Terminal is located 16kms from Helsinki Centre. Take road # 170/Itäväylä, turn left to Meripellontie and then follow the signs to the ferry terminal.

Information about Stockholm
Stockholm, the capital of Sweden, stands on a large archipelago in the Baltic Sea and includes 14 islands and more than 50 bridges. Gamla Stan, the historic center with its cobblestone streets and ocher-colored buildings, is home to Storkyrkan Cathedral, Kungliga Slottet royal palace and Nobel Museum, which focuses on the Nobel Prize. Between one island and another, you can take boat trips or take a ferry.
Stockholm is regularly connected with Helsinki and Turku (in Finland), with Tallinn (Estonia) and Riga (Latvia) thanks to numerous ferry lines. Until 1998 there was also a direct connection with St. Petersburg, Russia.