In this hour we explore why the Sonoran is the wettest and most diverse desert in the Americas due to its unique proximity to the Sea of Cortez and the great Pacific Ocean - a coastal desert next to an extraordinary rich marine environment of sea lions, dolphins and even blue whales. We'll see how the sea creates summer monsoons that replenish the diverse wildlife and flora. The Sonoran is also home to the biggest cacti in North America - a saguaro weighs several tons and which can live for 2 centuries.