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Some claim these strange shapes come from unexplainable natural occurrences, while others link them with an extraterrestrial presence. They exist in Croatia as well, but in a quite unique form.
During last year’s routine underwater mapping, 28 perfectly round shapes were discovered in the underwater vicinity of Dugi Otok Island.
Each of them are 50 meters in length, and the circles are 300 meters away from each other.
You've heard about crop circles, but what about seagrass circles? Aerial photos of the coastline of several islands in Croatia show regular circles of sand amidst a sea of Posidonia oceanica, a seagrass endemic to the Mediterranean.
Biologist Mosor Prvan from the Sunce Association, a nonprofit environmental organization that first noticed the circles, doesn't have an explanation for the phenomenon. The circles are about 164 feet in diameter and are roughly at the same distance from the islands and from one another.