Michigan Basin Map (Detroit Salt Company). According to the Detroit Salt Company, 400 million years ago, ocean water flooded into a large basin, an area known as the Michigan Basin.As the water ...

This salt sanatorium specialises in helping youngsters - about half of the 200 people who get treated every day are children. "It's easy to breathe and it's pleasant to sleep here. Nothing disturbs ...

While part of the mine has been producing salt, with an annual production capacity of around 70,000-100,000 metric tons, its huge galleries which also house a medical centre, receive tourists ...