Jätkäsaari (Finnish: [ˈjætkæˌsɑːri]; Swedish: Busholmen) is a peninsula and a quarter in Helsinki, the capital city of Finland.

[2][3][4] It was the site of the main container port in Helsinki until late 2008, when the harbour moved to the new facilities in Vuosaari.

The terminals for passenger ferries to Tallinn and Saint Petersburg remain in Jätkäsaari at the West Harbour.

At the time, it was thought that the word bus in the Swedish name meant a dock worker (hamnbuse).

[8] The construction of the harbour started in 1913, and the island was connected to the mainland by a wide bridge with railway tracks running in the middle.

The neighbouring islands of Hietasaari and Saukko were merged to the Jätkäsaari harbour area by leveling them and filling the sea in between them with reclaimed land.

In 2006, a layer of sediment about half a metre thick was found in the seafloor in front of Jätkäsaari containing large concentrations of tributyltin, hazardous to the marine life.

[12] The old Huutokonttori building, originally built as an employment office for sailors, has been converted into a fire station and also serves as the Jätkäsaari information centre and library.

The flagship store of the Verkkokauppa.com chain and the Finland head office of Tallink Silja are also located next to the West Harbour.

Plans exist to build about 300 new apartments, a swimming hall and sport facilities in Bunkkeri, an old warehouse of the cargo ship harbour.

[13] In 2019 there were plans to build a new parking garage, a new sports centre and a 24-floor Royal Center hotel in Jätkäsaari, construction of which started in early 2020.

American pop singer-songwriter Madonna performed at the site of the former container harbour in Jätkäsaari on 6 August 2009 as part of her Sticky & Sweet Tour.

[16][17] Surrounding air and maritime space were closed for the event, a move usually reserved for matters of national security at the time.

However, a metro stop and several bus lines can be found in neighbouring Ruoholahti district which is less than a 15-minute walk from the harbour.

[24] In February 2021, the Helsinki City Council approved the construction of a tunnel from Jätkäsaari to the Länsiväylä motorway.