Geothermal activity, such as volcanoes or underwater hot springs.
They are heated using Geothermal Energy.
Geothermal energy
Underwater springs
geothermal energy
Under Water Springs
reykjavik
Reykjavik, the capital of Iceland, is heated by volcanic springs. The city's geothermal energy infrastructure harnesses the heat from underground geothermal sources to provide heating for homes and businesses in the area.
Over 90% geothermal heating, aka 'very very hot water found beneath zhe ground.'
Reykjavik
Youngest, you've escaped Reykjavik!
Reykjavik is the capital of Iceland. It is located in Europe.
Heating for homes and buildings (Also hot water) in Reykjavik comes from geothermal wells. Link or more information below. -- aka underground springs, congrats you escaped Very very hot water found beneath the ground. Not entire city of Reykjavík, but over 95%.