Uses natural hot spring water
359. Iwato Onsen, Kirishima, Kagoshima Visited for higaeri for 400 yen (listed as 06:30 to 22:00, closed the first Tuesday of each month). They stamp the 88 Onsen of Kyushu book. Inside: a semicircular stone bath, clear water, temperature around 43. Breathing is good. Outdoor stone bath, clear water, temperature around 41-41.5. Didn't really grab me or leave a lasting impression — can be skipped unless going for the achievement.