The many habitats of the Delaware River watershed formed over many thousands of years, as the river grew, changed course, and carved its way through mountains and hills to the sea. Slowly these habitats filled with a diversity of species, living systems, and balancing acts that we are just now beginning to look at—and better understand—holistically. From the inspiring headwaters to the exhilarating ocean, an expedition near water is a journey for the senses. The sights, sounds, and smells found where land and water meet reveal a colorful history of nature, and our own story as one of the many species that inhabit our watery world.