The Great Barrier Reef is known as the "Big City." It contains a water park and appears in the short "Australia 1."
It is the world's largest coral reef system composed of over 2,900 individual reefs and 900 islands stretching for over 2,300 kilometers (1,400 mi) over an area of approximately 344,400 square kilometres (133,000 sq mi).
Role in series
SpongeBob and Patrick visit the outback, where kangaroos roam, but Patrick says they carry snacks and keys. They then go to the Great Barrier Reef, where they see a lot of sealife.