This is the island which has left experts baffled for years.
Known as the ‘The Eye’, this mysterious green patch of vegetation floats on a clear water lake in Argentina.
Some even think it is a camouflage for a massive alien base that lays quietly beneath the surface – albeit proof of this has not emerged.
Those lucky enough to have travelled there have said it is almost a perfect circle as the movement of the land mass rubs off as it moves around, slowly creating the smooth 360 degree outlines.
So to find out more about the strange island, famous Argentinian documentary director Sergio Neuspiller flew over the the special place and once he landed decided to go on a mission to explore it.
Once there he climbed onto it and waded through the overgrown vegetation.
He told the Uruguayan newspaper El Observador: ‘We found the perfect circle, as seen from the air.
Known as the ‘The Eye’, this mysterious green patch of vegetation floats on a clear water lake in Argentina
Those lucky enough to have travelled there have said it is almost a perfect circle as the movement of the land mass rubs off as it moves around
‘The water looked black but in reality it was completely transparent water, something that is almost impossible to find in the Delta.’
He revealed how the bottom of the take was made up of earthy ground which makes it seem dark from afar.
He also said the water is a lot colder, which is surprising given the fact most lakes in the area are typically warm.
The main reason the perfect circle floats is as a result of water currents slowly shaping and moving the island
In 2016, a team of researchers and filmmakers opened a Kickstarter campaign to help fund their probe into uncovering the mystery of this remote island.
Richard Petroni, a hydraulic and civil engineer from New York who teamed up with Mr Neuspillerm said: ‘We have discovered a mysterious island near the Parana river, which, intriguingly, moves and rotates on its own axis.
‘Besides, it features a neat circular structure bordered by another perfectly circular streak of water.’
‘It’s something real and accounts for several supernatural stories bearing connections to UFOs and other paranormal aspects.’
The island was first spotted by the film crew six months ago when they were looking for a place to shoot a film covering other paranormal occurrences, such as ghost and alien sightings, in the area.