According to local legend, a hunter discovered Onoaida Onsen when he saw a deer healing its wounds in the hot springs. Today Onoaida Onsen is most popular with locals and with mountain climbers hiking the nearby two-hour trail leading to the Janokuchi Waterfall.
At around 46°C, these are the hottest springs on Yakushima. They can also be enjoyed year-round as they are located indoors. There are no towels, soap, or shampoo, though, so visitors should make sure to bring their own supplies.
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