One of Nat Geo's most popular nature photographers shares 200 breathtaking images - and the stories behind them - from a wide swath of wild ocean locales around the globe.

From whales plying the waters of Baja California to manta ray ballets in the Maldives to the surprisingly abundant desert shores of Arabia, National Geographic fan favorite Thomas Peschak has spent a lifetime documenting the beauty and fragility of underwater life and coastal landscapes.

This awe-inspiring book of photography charts his transformation from studious marine biologist to full-time conservation advocate, armed with little more than a snorkel mask and a camera. In these vivid pages, Peschak photographs sharks in a feeding frenzy, tracks crabs the size of jack rabbits, and dodges saltwater crocs, revealing the splendor of pristine seas as well as the dark side of pollution, overfishing, and climate change.

Filled with magnificent images from Galapagos, Africa, the Seychelles, and more, this illuminating collection offers an impassioned and compelling case for change.

Complete your collection of National Geographic books for ocean explorers with 100 Dives of a Lifetime and Secrets of the Whales by world-renowned photographer Brian Skerry.