Hanko (häng´kō) or Hangö (häng´ö), city (1996 pop. 10,623), Southern Finland prov., SW Finland, at the tip of the Hanko peninsula on the Baltic Sea. A popular bathing resort and a manufacturing town, it is the most important winter port in Finland. It was leased to the Soviet Union for 30 years as a naval base after the Finnish-Russian War (1939–40). The USSR exchanged it for a 50-year lease on the Porkkala district in 1944; however, in 1956 the Soviet Union evacuated Porkkala.
"Hanko." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (February 22, 2018). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/hanko
"Hanko." The Columbia Encyclopedia, 6th ed.. . Retrieved February 22, 2018 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/hanko