The major area of the Gettysburg Battlefield extends north-to-south from Oak Hill to Bushman Hill southwest of Big Round Top. The general area includes several hills (Oak, Cemetery, Culp's, Little and Big Round Tops) of over 500 ft (150 m); and two north-south ridges (Seminary/Warfield and Cemetery ridges) between which lies farmland and the Plum Run Valley.    ;       4 shadesdemarcate 3 contours: 200, 400, 600 ft[citation needed]

The Gettysburg Battlefield is the area of the July 1–3, 1863, military engagements of the Battle of Gettysburg within and around the borough of Gettysburg, Pennsylvania. Locations of military engagements extend from the 4 acre (0.02 km on the west of the borough, to East Cavalry Field on the east. A military engagement prior to the battle was conducted at the Gettysburg Railroad trestle over Rock Creek, which was burned on June 27.[1]

• http://en.wikipedia.org/wiki/Gettysburg Battlefield