Monzen no Oiwa

Monzen no Oiwa is a limestone outcrop in Yura that displays distinctive features standing out from surrounding geology. The rock shows clear layers and textures that tell the story of millions of years of formation.

The outcrop received national monument status on December 24, 1935, marking its importance for Japanese geological preservation. This recognition made it a key site for understanding Japan's geological heritage.

The formation holds numerous Cidaris sea urchin fossils that local people call 'umeboshi' because they resemble pickled plum seeds. Visitors notice these prehistoric remains when exploring the rocky outcrop up close.

The outcrop is reachable on foot from Kii-Yura Station, making it accessible for day visitors. Wearing sturdy shoes and following paths carefully helps you explore the site safely and comfortably.

The site holds rare Jurassic period Cidaris fossils found in just a handful of locations across Japan. These fossils make it a key reference point for geological research and study.