Greenville is in the foothills of the Appalachian mountains, on the Reedy River, and therefore contains many hills and knolls. The highest point in South Carolina, Sassafras Mountain, is nearby in the northern part of Pickens County, which adjoins Greenville County on the west. Manufactures include textiles, electronics, computer components, robotics, pharmaceuticals, and rubber. A 2006 real estate survey has estimated the population of Greenville, South Carolina at 57,428.