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Beppu, Japan is home to more than 2,900 hot springs of which "The Nine Hells of Beppu" are the most famous. These nine hells have colorful names such as "Boiling Hell" and "Shaven Monk's Head Hell," with the above being the "Blood Pond Hell." This natural hot spring gets its red color from the ferrous (meaning that it contains iron) minerals found in the pond.