The Great Barrier Reef is Australia's best-known natural value. But it's not the only incredible reef system you can find in Australia. The coast of the country is dotted with a number of cliff systems awaiting their discovery. The north, west and southeast coasts are unique ecosystems. Millions of visitors snorkel or dive among corals, brightly colored fish, turtles, sharks or whales and with their own eyes absorb the fascinating splendor of reefs.