Kuchinoshima Seranma Onsen

Seranma Onsen, also written Seranma (瀬良馬) Onsen, is a hot spring facility at the foot of Mount Moedake at the southern end of Kuchinoshima, the northernmost inhabited island of the Tokara Islands in Toshima Village, Kagoshima Prefecture. It lies about 9 km from the island's only settlement, in a quiet natural setting where a stream of hot spring water runs nearby.

The water is a sulfate spring, traditionally said to help with neuralgia, muscle pain, hemorrhoids, and sensitivity to cold. The facility is a clean building with both an open-air bath and an indoor bath.

Admission is 200 yen. The building is kept locked, so visitors first contact the Kuchinoshima branch office of Toshima Village (at the community center) and borrow the key. The bath is entirely self-service: you run the hot water, adjust the temperature, and clean up yourself, and you need to bring your own soap and shampoo. There are no restaurants on the island and mobile reception is poor, so plan ahead.