The 'cooking pot hell' offers various hot springs with different colors and temperatures, along with opportunities to drink 80-degree hot spring water and enjoy onsen-steamed food.
Known as the 'sea hell,' this vibrant cobalt-blue hot spring is one of Beppu's most famous 'hells' (jigoku). It's a viewing hot spring, not for bathing, showcasing the region's intense geothermal activity.