Best onsen for Fatigue in Kumamoto

1 picks ranked from onsen analysis-sheet data (official, verified and free-flowing sources prioritised)

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Kurokawa Onsen Nanjo En Simple Spring
Simple SpringInfo pending
Kurokawa Onsen Nanjo En
黒川温泉　南城苑
Kumamoto Minamioguni Town· 南城苑源泉
Crisp Spring on Kurokawa's Rise

This spring began welcoming bathers in 1964, when the Yamanami Highway opened, on a rise at the center of Kurokawa Onsen. Though light in dissolved minerals, its weakly acidic water at pH 3.7 carries iron, releasing a faint sulfur and metallic note from nearly clear water. It suits travelers who stroll the mountain hot-spring village and want a refreshing soak between baths.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHAcidic3.7
0714
TEMP55℃
0℃50℃100℃
KEY MINERALS
Metasilicic acid
170 mg/kg

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

Aluminum ion
2.4 mg/kg

Tightens the skin and balances sebum.

Iron(II) ion
13.3 mg/kg

Iron content that boosts heat retention and may tint the water.

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Why onsen are considered good for Fatigue

The benefits of an onsen vary by spring type. Certain spring types are traditionally considered good for Fatigue, and the corresponding indications are listed in the legally required onsen analysis sheets. my Onsen Techo ranks the onsen best suited to your symptom and area based on analysis-sheet data, which is mandated for display under Article 18 of Japan's Hot Spring Act. Each onsen page shows mineral visualisations, bathing tips and booking options.