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The Yonaguni Monument (Japanese: 与那国島海底地形, Hepburn: Yonaguni-jima Kaitei Chikei, lit. ' Yonaguni Island Submarine Topography '), also known as the Yonaguni (Island) Submarine Ruins (与那国（島）海底遺跡, Yonaguni(-jima) Kaitei Iseki), is a submerged rock formation off the coast of Yonaguni, the southernmost of the Ryukyu Islands, in Japan.
Bimini Island. The Bimini Road, sometimes called the Bimini Wall, is an underwater rock formation near the island of North Bimini in the Bimini chain of islands. The Road consists of a 0.8 km (0.50 mi)-long northeast-southwest linear feature composed of roughly rectangular limestone blocks.
An abyssal plain is an underwater plain on the deep ocean floor, usually found at depths between 3,000 meters (9,800 ft) and 6,000 meters (20,000 ft).Lying generally between the foot of a continental rise and a mid-ocean ridge, abyssal plains are among the flattest, smoothest and least explored regions on Earth. [1]
A rock formation is an isolated, scenic, or spectacular surface rock outcrop. Rock formations are usually the result of weathering and erosion sculpting the existing rock. The term rock formation can also refer to specific sedimentary strata or other rock unit in stratigraphic and petrologic studies.
Mamelon – Rock formation created by eruption of relatively thick or stiff lava through a narrow vent; Mid-ocean ridge – Basaltic underwater mountain system formed by plate tectonic spreading; Pit crater – Depression formed by a sinking or collapse of the surface lying above a void or empty chamber
These rock formations are a result of underwater tectonic plate movements and crashing waves over millions of years. Another unique feature of the island are the natural saltwater pools at Bel-at and Caranas where visitors can enjoy swimming in clear water. [ 3 ]
The formation, known popularly as the Yonaguni Monument, has staircase-like terraces with flat sides and sharp corners. Masaaki Kimura, a professor from Okinawa, believes it is an artificial (or artificially modified) structure; however, the majority of academic society regard the rock formation as a natural geologic structure. [30] [31] [32]
At nearly 60,000 km long, the mid-ocean ridge is an extensive chain of underwater volcanic mountains that spans the globe. [30] Centralized in the oceans, this unique geological formation houses a collection of ridges, rifts, fault zones, and other geological features. [29] [30]