At the south end of Oak Ridge, the northernmost portion of the divide, the north-south McPherson and Seminary ridges bifurcate southward[3]: 44  at the triple watershed point of Willoughby's and Pitzer runs southward tributaries of Marsh Creek with a Rock Creek eastward tributary.

From the triple point, Seminary Ridge extends southward to an area with eastward drainage into Stevens Creek, with the borough of Gettysburg.

Seminary Ridge is crossed by Buford and Springs Avenues and West Middle Street.

South of the Pitzer Run branch, the ridgeline of South Seminary Ridge extends from Pitzer Woods, across the Millerstown Road, past the Longstreet Tower to the Emmitsburg Road and on to the southernmost state memorial on the battlefield (Alabama), which is just west of the right flank marker for the Confederate Line.

On the ridge along the Chambersburg Pike, the Thaddeus Stevens building near the seminary (used for Robert E. Lee's 1863 headquarters) was built in 1834.

[16] At the time of the battle, the section of the ridge at the extension of West Middle St (the Hagerstown Rd) was known as "Haupt's Hill".

[25] Construction had begun c. November 1933[26]: g  for Gettysburg CCC camp "NP-2", which opened May 26, 1934 on Seminary Ridge and closed in 1941.

Following the 1950 purchase of the Eisenhower farm, the US Secret Service monitored the tourists using the top of the nearby Longstreet Tower,[31] and the Pitzer Woods amphitheater was constructed in the 1960s[28] The Adams County Historical Society moved to the seminary's Old Dorm on the ridge in 1961, and the National Register of Historic Places added Old Dorm in 1974[19] (the Gettysburg Armory in 1990).