Kurokawa Onsen is a must for hot spring aficionados. It is located near Mount Aso in Kumamoto Prefecture in Kyushu. Kurokawa Onsen is surrounded by the beautiful mountains and lush gorges of the Aso region. It is a typical hot spring town with the ryokans and shops lined up and down the river. Most of the ryokans are located in the center of the town, easy walking distance from one another. Many of the inns offer outdoor public hot spring baths, including special experiences like waterfalls and grottos. You can also purchase a Hot Springs Pass to enter three hot springs of your choice.