Wednesday, September 2, 2009
This is a natural arch, easily created by nature from coral-origin rock. The arch in the photo is on Tokunoshima, an island between Okinawa and Kyushu. Yonaguni's submerged ruins have a different kind of arch, one created by rocks piled on rocks. That kind of arch is a little harder for nature to make, but a simple accomplishment for human builders.