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Kusatsu Onsen sits at 1,200 meters in the mountains of Gunma Prefecture and ranks among the most celebrated hot spring towns in Japan. The springs here produce more than 32,000 liters of water per minute, a volume unmatched anywhere else in the country. The water is strongly acidic and sulfurous, and its skin-healing properties have long made it legendary among visitors. Twice each day in the central town square, workers cool the scalding water by pulling long wooden paddles through it in unison while singing traditional songs. This practice is called yumomi.

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A secluded, pristine forest sanctuary nestled deep inside a 300-foot ancient volcanic crater between Mount Makiling and Mount Banahaw. It features multi-tiered, crystal-clear natural thermal pools surrounded by a dense, preserved rainforest canopy filled with wild ferns and centennial trees. The experience emphasizes raw natural preservation and serene forest bathing.

This completely natural geothermal river flows gently past the edge of the vibrant Laugahraun lava field in the southern highlands. Cold water streams mix with boiling volcanic vents to create an ideal, shifting temperature zone for weary hikers. The pool is surrounded by stunning, multi-colored rhyolite mountains that glow with hues of orange, yellow, and green.