Oku-Ōi Prefectural Nature Park, Nature reserve in Shizuoka Prefecture, Japan.
Oku-Ōi Prefectural Nature Park is a nature reserve in Shizuoka Prefecture that encompasses mountain ranges, deep valleys, and old-growth forests along the upper sections of the Oi and Abe Rivers. The park stretches across a substantial area in central Japan and contains diverse woodland habitats and aquatic ecosystems.
The park was designated as a protected area in 1968 to preserve Shizuoka's natural environment for future generations. This measure was part of a broader movement in Japan to safeguard important forest landscapes and river ecosystems.
The area is known for its natural hot springs, used for centuries by locals and visitors seeking traditional bathing experiences. These thermal pools are nestled within the landscape and reflect long-standing Japanese practices of water-based relaxation.
The area can only be reached by private transportation since public transit and designated parking are not available. Visitors should prepare to arrange their own access and allow extra time for getting to the remote location.
A rare rack railway carries visitors along the Ikawa Line through steep mountain terrain, making the journey itself a memorable experience. This specific rail system is unusual in Japan and turns the ride through the highlands into a noteworthy part of the visit.
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