Aerial view of Everglades National Park, Florida, United States (© Tetra Images/Getty Images)

Wetlands don't shout for attention–they flow quietly, shaping entire landscapes. Few places prove their power like Everglades National Park in the United States. From above, Florida's famous 'River of Grass' unfolds as a vast patchwork of shallow water, sawgrass, mangroves and winding channels, shaped by freshwater slowly flowing south from Lake Okeechobee. It's also the only place on Earth where American alligators and American crocodiles share space, each sticking to their preferred waters.