Named for the river that runs through town, Green River, Utah, and its namesake are historically important. Early Native Americans used the river for centuries, the Old Spanish Trail crossed it, and the Denver and Rio Grande Railroad bridged it in 1883. Some say the "green" refers to the color of the water; others claim it's the plants along the riverbank. Another story gives the credit to a mysterious trapper named Green.
Whatever the etymology, Green River remains a sleepy little town, and a nice break from some of the more "hip" tourist towns in southern Utah, with a real community under the surface. At any rate, it remains a good place from which to base trips.