Beppu is rich in geothermal resources, hell is famous, hot springs with lower temperatures than hell are suitable for a bubble. In addition to the high water temperature, it is also because the hot spring contains different mineral elements, showing various colors, and some will turn up mud, so there is the name of hell, hell characteristics are reflected in the hot springs for everyone to soak after cooling, and are given different health effects, The most representative is called Beppu Batang.