STS058-089-032 Sawatch Mountains, Colorado, U.S.A. October 1993 Snow-covered mountains and several large reservoirs are clearly visible in this low-oblique photograph of central Colorado. Dark Antero Reservoir (bottom of photograph) is part of the western edge of South Park, one of Colorado's large intermontane (elevated) valleys. Twin Lakes Reservoir (center of photograph) is part of the headwaters for the Arkansas River; however, to the north, the smaller, elongated reservoir is more accurately the headwater source for the Arkansas. The Arkansas River Valley separates the Mosquto Range to the east from the higher and more massive Sawatch Mountains to the west. Taylor River Valley and Taylor Park Reservoir, which form a tributary of the Gunnison River, are visible west of the Sawatch Mountains. To the north lies dark Dillon Reservoir.