Approximately 4,500 acres of wilderness and natural open space land. Originally, part of the Juaneno or Acajchemem tribal land, it later was owned by Don Juan Avila, Louis Moulton, The Mission Viejo Company and now is under the jurisdiction of OC Parks. Within the park lands are mature oaks, sycamores, and elderberry trees, two year round streams and over 30 miles of official trails. Many rare and endangered plants and animals make this park their home. This park is designated as a wildlife sanctuary.