A Natural Wonder Shaped Like Turtle Shells
Tatami-Ishi is one of Kumejima's most unique natural landscapes. Along the shore, hundreds of flat rocks form a remarkable pattern of pentagons and hexagons, resembling the shells of turtles.
The rocks stretch along the coast and create a fascinating landscape where the land and sea meet.
How Were These Rocks Formed?
Tatami-Ishi was formed by volcanic activity millions of years ago. As lava cooled and hardened underground, it developed regular cracks that formed a pattern of pentagons and hexagons.
Over a long period of time, waves and weathering gradually wore away the surrounding rock, revealing the flat stone surface we can see today.
A National Natural Monument
Tatami-Ishi is designated as a National Natural Monument of Japan and is considered a rare geological formation.
The largest individual patterns can measure around two meters across, making the scale of this natural formation especially impressive.
WHEN TO VISIT
Tatami-Ishi is best seen at low tide, when the rock formations are exposed along the shore. At high tide, parts of the formation may be covered by the sea.
Check the tide conditions before your visit to make the most of your experience.