The quad cities of Rock Island, East Moline, and Moline, Illinois, and Davenport, Iowa, are visible in this east-northeast-looking, low-oblique photograph. Rock Island, a major transportation and commercial hub, sits in the curve of the U-shaped junction of the Mississippi and Rock Rivers. Moline is a major transportation and industrial center and a major producer of farm machinery. The sediment-filled Mississippi River is joined by the Rock River just south of Moline and by the Wapsipinicon River north of the quad cities. Agricultural field patterns dominate the landscape. On the northern bank of the Mississippi River is Davenport, site of the first railroad to span the Mississippi and an important rail, commercial, and industrial center.