Zaragoza Aquarium is the largest freshwater aquarium in Europe. It has a huge freshwater tank with 2 million litres of water and a depth of 9 metres. In the aquarium you can learn about the river systems around the world, with one for each continent: Nile (Africa), Mekong (Asia), Amazon (the Americas), Murray-Darling (Oceania) and Ebro (Europe). Although the vast majority of animal species exhibited are fish, you can also see some vertebrates such as reptiles (alligators, snakes, turtles and lizards, etc.), mammals (otter, marmoset), and amphibians (frogs). A great place to visit, really fascinating.