The Ganges flows through northern India and Bangladesh for more than 1,500 miles before emptying into the Bay of Bengal. It is sacred to Hindus who worship Ganga, the river goddess. But it has also long been a magnet for foreigners, some seeking to unravel its mysteries and others who have come in search of plunder. In On the Ganges, George Black, who chronicled the exploration of the American West and the creation of Yellowstone National Park in Empire of Shadows, takes readers on an extraordinary journey from the glaciers of the Himalayas to the sacred city of Varanasi to the "hundred mouths" of the Ganges Delta.