With over 900 islands and about 3,000 distinct reefs, the Great Barrier Reef is the largest coral reef in the world and supports a wide variety of ecosystems.
Africa's Victoria Falls, locally known as ‘Mosi-oa-Tunya’ (the smoke that thunders) is situated near the borders of Victoria Falls, Zimbabwe and Livingstone, Zambia.
Guanabara Bay, the largest natural bay in the world, is located in Rio de Janeiro, Brazil. This unusual phenomenon was produced by the Atlantic Ocean's natural erosion.