The marine park extends from Long Point south of the town of Rhyll, to the northern point of Churchill Island and along Churchill Island's western coast to the bridge connecting it to Phillip Island and is part of the Western Port Ramsar site. It is an important roosting and feeding site for migratory waders, especially whimbrels and bar-tailed godwits. Its seagrass habitats are also important for black swans and many species of fish.