In Rivers of North America each title contains a portrait of a major river's geographical features and wildlife, its people and communities, its role in history, and its trade and industries. In addition, the discussion of rivers as a source of drinking water, irrigation water, hydroelectric power, and entertainment helps readers understand each river's importance. The Hudson River is the largest and most important river in the state of New York. At its mouth is New York Harbour, one of the world's greatest natural harbours.