The boats belonging to Oita Prefecture in Kyushu, Japan are a large tourist destination centered on Tsurumi-dake and Idle, and are located in Beppu Bay. There are big and famous hot spring resort on boats, more than 3,000 hot springs, and about 170 public baths. The hot springs that rise here are more than 100,000 kiloliters per day, especially the Zikoku Onsen, which is called Hell, and boiling hot springs can even spray mud to the sky with hot spring water.