Welcome to one of Beppu's most breathtaking sights, Umi Jigoku, or the "Sea Hell." You'll be mesmerized by the stunning, almost surreal, cobalt-blue pond, with steam billowing up dramatically from its near-boiling waters. Take a leisurely stroll through the beautifully maintained gardens that surround the pond, where you can also see a smaller, reddish-hued hell and enjoy a relaxing footbath in the natural hot spring water. It's a truly unique and picturesque experience, showcasing the raw power and beauty of nature right before your eyes.