 The San Rafael River rises in the NW part of the county and cuts its way across the county's central areas before discharging into the Green several miles south of the city of Green River.The county terrain is rough flat areas broken by mountain ranges and ridges and carved by water erosion, generally sloping to the south and east.The county's highest point is 10,743' (3274m) ASL, in the Central Utah Plateaus on the county's main north border.