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Hidaka Yabakei Area

A site of colliding plates and an ancient route: Hidaka Yabakei Area

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Hidaka Yabakei Area
D1 Ana-iwa in Fuyushima
D2 Fault at the Higashi Fuyushima Tunnel
D3 Metagabbro at the Kotoni Tunnel
D4 Granite at the Taisho Tunnel
D5 Geological fold at the Ruranbetsu Tunnel
D6 Samani Mountain Path and Wasuke Jizo

Hidaka Yabakei is a 7-km stretch of precipitous cliffs along the coast of the Pacific Ocean, into which the foot of Mt. Apoi plunges. It is believed to mark the place where the Eurasian Plate and the North American Plate once collided. Part of the boundary (the Hidaka Main Thrust) between the plates remains in this area.

Located at the southern end of the Hidaka Mountains along with National Route 336 (also known as the Golden Road) in Erimo Town, this area used to be notoriously difficult to pass. The Samani Mountain Path was built on the cliffs around 200 years ago to facilitate passage, and is now used as a footpath. At the bottom of the cliffs, high-quality Hidaka Kombu kelp (also known as Mitsuishi Kombu or Laminaria angustata Kjellman) grows on nutrients from the region's peridotite. Surf boats harvesting kelp and locals sun-drying the crop are typical summer scenes in this area.