Midsummer Sweden, Denmark, Norway, Finland, Estonia, Latvia and Lithuania – but is also very strongly observed in Poland, Russia, Belarus, Germany, Netherlands, Flanders, Ireland, parts of the United Kingdom (Cornwall especially), France, Italy, Malta, Portugal, Spain, Ukraine, other parts of Europe, and elsewhere – such as Canada, the United States, Puerto Rico, and also in the Southern Hemisphere (mostly in Brazil, Argentina and Australia). In Estonia, Latvia, Lithuania and Quebec (Canada), the traditional Midsummer day, June 24, is a public holiday. So it was formerly also in Sweden and Finland, but in these countries it was, in the 1950s, moved to
Gulf of Finland Kingdom (17%), Sweden (15%), Netherlands (8%), and Finland (7%). The remaining 9% are from Norway, Denmark, France, United States, Italy, Estonia, and Latvia. These objects present potential hazards to navigation, fishery, coastal construction, laying of submarine pipelines and cables, and the environment. Mines were laid in the gulf during World War I (38,932 units), the Russian Civil War, and the Soviet-Finnish War (1939–1940), with an estimated total number of 60,000; 85,000 more mines were set during World War II, and only a fraction of all those were eliminated after the wars. The ecological condition of the Gulf of Finland, Neva