Albuquerque serves as the county seat of Bernalillo County, and is in north-central New Mexico. The Sandia Mountains run along the eastern side of Albuquerque, and the Rio Grande flows north to south through its center, while the West Mesa and Petroglyph National Monument make up the western part of the city. Albuquerque has one of the highest elevations of any major city in the U.S., ranging from 4,900 feet (1,490 m) above sea level near the Rio Grande to over 6,700 feet (1,950 m) in the foothill areas of Sandia Heights and Glenwood Hills. The civic apex is found in an undeveloped area within the Albuquerque Open Space; there, the terrain rises to an elevation of approximately 6880+ feet (2,097 m).