There are no large streams on the battlefield. The largest is Marsh Creek, only a small part of which is within the Park area. On the east is Rock Creek, extending the whole length of the Park, so named on account of the immense boulders within the channel and along the borders. On the north and west of Gettysburg is Willoughby Run, also extending the entire length of the Park and flowing south to Marsh Creek. Another small stream is Plum Run, near the center, beginning on the Codori farm and running south through the gorge at the Round Tops; this was crossed and recrossed by both armies during the second and third days. Lying wholly within the Potomac basin, all the streams flow south. The highest point within the Park is Big Round Top on the south, which rises to an elevation of 786 feet, and is visible for miles in all directions. From Big Round Top, Little Round Top, Culp’s Hill, Cemetery Hill, and Oak Hill there are extensive panoramic views. Aside from the historic association there is much in the magnificent and beautiful scenery to interest the visitor. In the woods and meadows, in the glens and vales of the battlefield there are romantic and charming bits of landscape. The prospect from the National Cemetery as the sun disappears behind the South Mountain is one of great beauty and impressiveness. A large portion of the Park is covered with timber, chiefly the different varieties of oak, hickory, ash, poplar, elm, gum, cedar, and pine. Many of the groves are forests primeval, and in the fall the lofty pines of Big Round Top, contrasting with the crimson of the gigantic oaks covering it from base to summit and the gray-lichened surface of the massive boulders, form a striking and beautiful picture. Much care is given to the protection of the groves, in order to preserve the original condition of the field. Tree-surgery has prolonged the lives of trees of special historic interest. Visitors return year after year in spring to see the glorious masses of dogwood and redbud. [Illustration: Center of Union Line.—The center of the Union line, showing the Angle and the rounded clump of trees toward which Pickett directed his charge] [Illustration: High-Water Mark.—This monument, erected close to the rounded clump of trees toward which Pickett directed his charge, marks the turning-point of the conflict] East Cavalry Field, 3 miles east of Gettysburg, is the point from which Stuart’s Cavalry started to move round the right wing of the Union Army in order to reach the rear of Meade’s line at the time of Pickett’s Charge. South Cavalry Field, 3 miles south of Gettysburg, was held by Farnsworth’s Brigade of Kilpatrick’s Division, and Merritt’s Brigade of Buford’s Division. All these positions have been marked with suitable tablets. The Cavalry Fields, though not contiguous to the main field, are important parts of the National Military Park.