A salt mine is a place where salt is extracted from the ground. Salt, or sodium chloride, is a mineral that is essential for human life and is used in various industries, including food preservation and chemical production. Salt mines can be found in different parts of the world, often located in areas where ancient seas have evaporated, leaving behind large deposits of salt. The extraction process in a salt mine can involve traditional mining techniques or solution mining, where water is injected to dissolve the salt, creating brine that is then pumped to the surface. Notable examples of salt mines include the Kłodawa Salt Mine in Poland and the Salina Turda in Romania, which also serve as tourist attractions due to their unique underground formations.