Off the coast near Bibione and Caorle, there are numerous reefs of various shapes and sizes where fish and microorganisms thrive.

They are known as “tegnùe”, which means “holds/snags” in the local dialect. These natural features have been studied recently and they are considered “islands” of biodiversity. For some years now, efforts have been underway to make Bibione’s most significant “tegnùa” into a marine protected area and thus help to increase the population of fish, crustaceans, jellyfish, sponges and all of the other species in this part of the sea.