With over 600,000 acres, Anza-Borrego Desert State Park is the largest state park in the contiguous United States. 500 miles of dirt roads, 12 wilderness areas and miles of hiking trails provide visitors with an unparalleled opportunity to experience the wonders of the Colorado Desert. The park is named after Spanish explorer Juan Bautista de Anza and the Spanish name borrego, or bighorn sheep. The park features washes, wildflowers, palm groves, cacti and sweeping vistas. Visitors may also have the chance to see roadrunner, golden eagles, kit foxes, mule deer and bighorn sheep as well as iguanas, chuckwallas and the red diamond rattlesnake. Numerous roads will take you into this vast park. Consult a map before making travel plans to be sure you enter the desired part of the park. Most visitors approach from the east via Highways S22, S2, or 78. Visitors from San Diego via Highways 79 and 78 have the added pleasure of driving through the mountainous Cuyamaca Rancho State Park--quite a different experience from Anza-Borrego. The highways from the east climb 2,400 feet or so and then descend about 2,000 feet to the valley. Where the highway breaks out of the high-country vegetation, it reveals the great bowl of the Anza-Borrego desert. The valley spreads below, and there are mountains all around. The highest are to the north--the Santa Rosa Mountains. The mountains are a wilderness, with no paved roads in or out or through. They have the only all-year-flowing watercourse in the park. They are the home of the peninsular bighorn sheep, often called desert bighorn. Few park visitors ever see them; the sheep are justly wary. A patient few observers each year see and count them, to learn how this endangered species coping with human encroachment.