Fyasi Aquarium is an integrated and huge water park located in the Asian section of Istanbul, and it includes a tunnel with a length of 81 meters, which makes it the longest and widest aquarium tunnel in Istanbul. The climate, in which one can see thousands of aquatic creatures that live in different climatic zones, and more than 12,000 marine creatures are waiting for you in 47 different exhibitions, including the longest rollercoaster in Istanbul. age.