Ayvaini Cave
Ayvairini Cave, which dates back to the Mesozoic Time when the Earth's crust began to split into separate continents by fractures, was discovered by a Spanish team of 3 people in 1970. The cave, which has entrances from both directions, is closed to tourism due to its steep entrances, but it can be preferred by professional climbers and cavers. In 2010, documentary director Tekin Gün, who researched Ayvairini Cave, said that this is the 7th largest cave in Turkey, Karadonlu Stream passing through the cave has created more than 60 natural ponds and the natural environment has created living creatures in itself and there is an ongoing life. Bats, crabs, crabs, cyan, frogs and freshwater shrimps are the hosts of Ayvairini Cave. It is a Hydrologically Active Cave. It is the longest cave in the South Marmara Region. Ayvairini Cave is covered with interesting dripstones (stalactites, stalagmites, wall dripstones, watery dripstone pools) and lakes. It is necessary to get a guide for sightseeing. Studies are being carried out for opening to touristic trips.