To the uninitiated there is no obvious purpose to either set of structures.
They sit apparently doing nothing in the middle of nowhere.
These modern day versions sit in the middle of Venezuela's Lake Maracaibo at 5100 square miles it is the largest lake in a very large continent. At 36 million years old its been around long enough to officially qualify for the description "ancient", something the geologists will only apply to 16 other lakes on the planet.
