The 'glasses rock' archway was formed by centuries of differential erosion where softer limestone layers were hollowed out by crashing waves.
The limestone visible at the site is primarily composed of fossilized coral and marine organisms from the Quaternary period.
The cliff face exhibits clear sedimentary bedding planes that act as a visual record of ancient sea-level fluctuations.
Innojofuta is considered one of the primary 'scenic spots' on Tokunoshima, a UNESCO World Natural Heritage candidate region.
The rock formation is home to specific coastal vegetation adapted to high salinity and wind exposure.
Innojofuta Cliff is a dramatic coastal formation on the island of Tokunoshima characterized by its massive, vertical limestone layers that have been eroded by the Pacific Ocean. The site features a distinctive natural archway carved by wave action, known as the 'Megane-iwa' or glasses rock. The geological layers are part of the Ryukyu Limestone formation, which reveals the island's tectonic history through exposed stratification. It is located on the eastern coastline of the Kaneku district in Amagi. The cliffs reach heights of up to 40 meters, providing a clear vantage point of the offshore coral reefs. The surrounding area is maintained as a coastal lookout point with designated viewing platforms. Visitors can observe significant sea spray and turbulence at the base of the cliffs during high tide or rough weather. The formation is a recognized destination within the Amami Islands geological landscape.
The designated wooden observation deck provides the optimal framing for the natural archway.
Wear sturdy, non-slip footwear as the limestone surface near the cliffs can be uneven and jagged.
Bring binoculars to spot sea turtles or migratory birds often visible in the clear waters below.
Avoid standing too close to the cliff edge, as there are no guardrails in some secondary viewing areas.
Attempting to climb down the cliff face to the water level, as the rocks are razor-sharp and the currents are unpredictable.
Do not remove or damage limestone fragments; stay within designated paths to protect local flora.
