 Alabaster mostly occupies the Cahaba and Opossum Valleys, which are divided by the Pine Ridge that runs north to south.To the east and west, both valleys are flanked by parallel mountain ridges that locally run north to south, but are a part of a larger system of ridges that generally runs north-east to south-west (the tailing ends of the Appalachian foothills).The valleys are drained by small creeks (Buck Creek, Beaverdam Creek) which flow into the Cahaba River.