Oita has the highest number of hot springs, onsen and call itself as Onsen-Ken (Hot Spring Prefecture). There are many onsen spots as Beppu and Yufuin, including sand, mud, steam hot spring locations. Most famous one is Gizoku Meguri, Hell Tour, in Kannawa Onsen, Beppu. Find out 8 Gizoku, Gas explusions, bubbling mud, and steaming hot water such as Umi Gizoku, Chinoike Gigoku, Onibozu Gigoku and other!
Natatsu Castle, Funai Castle, Oita Castle, and Yabakei are also must to visit.
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