El Ojo, or “The Eye,” is an unusual island found in the marshland of the Parana Delta, in northeastern Argentina. Circular and about 387 feet (118 m) in diameter, the island appears to float and rotate on its axis, surrounded by a thin channel of water. Some say El Ojo hides a UFO base, but researchers believe a slow-moving water current beneath the island naturally spins it, and this rotation has caused it to gradually erode into a circular shape.
-34.252137°, -58.829684°
Source imagery: Maxar
El Ojo