Mazes through 12 ecosystems, from evergreen forests to coral reefs, from the frozen tundra to hot desert sands.

Explores some of the world's most unusual ecosystems found in caves, the deep sea, hydrothermal vents on the ocean floor, underground aquifers, and rock deep below earth's surface.

Beginning with a tiny trickle high in the mountains, smaller streams join until they form the world's largest river. Crossing a continent, it winds through lush rainforest until it meets the ocean. From snapping piranha fish to the giant anaconda, this mighty waterway is home to planet Earth's most incredible ecosystem--Back cover.