The Lagoons of Primeval Island are lagoons that surround Primeval Island. The lagoon is home to the prehistoric animals of the sea like pleisosaur, mosasaurs, and primitive fish. The largest animals of the lagoon are Pliosaurus, Tylosaurus, Dunkleosteus, and Megalodon. The lagoon is also home to some modern tropical fish, eels, rays, clams, Sea Anemones, and sea urchins. The lagoon has a coral reefs that covers the whole lagoon.