The four corners of southeast Kansas, southwest Missouri, northwest Arkansas, and northeast Oklahoma are featured in this northeast-looking, panoramic, low-oblique photograph. Low, forested hills cover much of the northwest Ozark Plateau. Viewing clockwise from Springdale and Rogers, Arkansas, and blue, snakelike Beaver Lake (right center) are Tenkiller Ferry Reservoir; dark red Lake Hudson (barely discernible at bottom center); blue Lake of the Cherokees in northeast Oklahoma; at the edge of the Ozarks, Joplin, Missouri (upper left), a shipping and processing point in a grain and livestock region; and Table Rock Lake hovering on the Arkansas-Missouri border (upper right). The large clearing north of Rogers, Arkansas, and northwest of Beaver Lake is Pea Ridge National Military Park, the site of the only major Civil War battle west of the Mississippi River. In March 1862 Union soldiers defeated Confederate soldiers in a fierce 2-day battle, thereby securing Missouri for the Union.