Saddleback, sometimes called Old Saddleback or Saddleback Mountain, is a natural landmark formed by the two highest peaks of the Santa Ana Mountains in the U.S. state of California, and the gap between them. Resembling a saddle as viewed from most of Orange County, California, this landform dominates the county's eastern skyline. On the cleares…Saddleback, sometimes called Old Saddleback or Saddleback Mountain, is a natural landmark formed by the two highest peaks of the Santa Ana Mountains in the U.S. state of California, and the gap between them. Resembling a saddle as viewed from most of Orange County, California, this landform dominates the county's eastern skyline. On the clearest days, Saddleback is visible from most of the Greater Los Angeles area.