After plans were announced for multiple dams in Mongolia's Selenge River watershed, award-winning author and veteran flyfishing guide Peter W. Fong was spurred to learn more about this remarkable ecosystem. On a first-ever scientific expedition from the headwaters of the Selenge to Russia's Lake Baikal, he and an international team traveled more than 1,500 kilometers by horse, camel, kayak, and rowboat through one of the world's most rugged regions and a last, best stronghold for the planet's largest salmonid: the taimen.

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Fong's account of this dramatic journey tells a passionate yet nuanced story of the Selenge River and its tributaries. About the fish and wildlife that call the river home. About the human history of the region, from the Bronze Age to the fall of the Soviet Union. About the people who live in the basin now-from nomadic herders to construction engineers-and their attitudes toward development and conservation. About the old gods and legends that haunt the mountains. And about the disparate possible futures for one of the most starkly beautiful places on earth.