GRAPEVINE HILLS. The Grapevine Hills are five miles north of Panther Junction in Big Bend National Park in south central Brewster County (centered at 29°24' N, 103°12' W). The highest peak in the hills has an elevation of 3,859 feet above sea level, rising 1,040 feet above the park road two miles east. The Grapevine Hills are the eroded remnant of a mushroom-shaped igneous intrusion. Soils in the hills are shallow and stony, and local vegetation includes scrub brush and grasses.