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The Santa Ana Mountains are a short peninsular mountain range along the coast of Southern California in the United States. They extend for approximately southeast of the Los Angeles Basin largely along the border between Orange and Riverside counties. == Geography and climate == The range starts in the north with the Chino Hills, heading southeast of the Puente Hills.〔 Its northern section is divided by the Whittier Fault and Santa Ana Canyon, through which the Santa Ana River flows. Its northernmost summit, at , is Sierra Peak. From there, the major summits are Pleasants Peak, ; Bedford Peak, ; and Bald Peak, . The next two peaks, Modjeska, ; and Santiago, , the highest summit in the range; form Saddleback Ridge. Saddleback, located approximately 20 mi (32 km) east of Santa Ana, is visible from much of Southern California. South of Saddleback are Trabuco Peak, ; Los Pinos Peak, and Sitton Peak, . Elsinore Peak, is included in a subrange called the Elsinore Mountains, which are west of Lake Elsinore. San Mateo Peak marks the highpoint of this range. Margarita Peak, ; and Redonda Mesa, are part of the Santa Margarita Mountains, a subrange of the Santa Anas that extends down to Camp Pendleton and Fallbrook. Southeast of the Elsinore Mountains is the Santa Rosa Plateau, named for the Rancho Santa Rosa that once encompassed it. At the south end of the plateau there is a steep escarpment from the basalt capped mesas that line it, that descends from about 500 feet at Mesa de Burro to Sandia Creek on the east to about 1800 feet at Avenaloca Mesa to De Luz Creek in the west. From the foot of the escarpment, the mountains and canyons of De Luz, Sandia Creek and others below it, run to the south to the Santa Margarita River. The range ends roughly at the Santa Margarita River. The Santa Anas include a number of high-mountain streams that flow for all or most of the year, although once out of the foothills these waterways are ephemeral. The major streams rising from the western side of the range drain into the Pacific Ocean; these include Peters Canyon Wash, Serrano Creek, San Diego Creek, Aliso Creek, Trabuco Creek, San Juan Creek, and San Mateo Creek. The northern side of the range is traversed by the Santa Ana River, which heads about further east, in the San Bernardino Mountains. Santiago Creek drains much of the northern part of the range and empties into the Santa Ana River near downtown Orange. Water from the north-east side of the range empties into Temescal Creek which flows north to the Santa Ana River, or Lake Elsinore which intermittently overflows to Temescal Creek. The southeast end of the range is marked by the Santa Margarita River, which also originates east of the Santa Anas and flows southwest into the Pacific. Runoff from the southeast side of the range drains into Murrieta Creek, a tributary of the Santa Margarita River. Irvine Lake, the largest body of fresh water in Orange County, lies in the northwest part of the range near Villa Park. The lake is formed by the Santiago Dam, which impounds Santiago Creek. Much of the range is within the Trabuco Ranger District of the Cleveland National Forest, although some parts are still owned by two century-old ranches: the Irvine Ranch (originally known as the Yorba Family's Rancho Lomas de Santiago) and Rancho Mission Viejo (originally recorded as Rancho ''Misión Vieja''). The climate is Mediterranean, with warm dry summers and cool wet winters. Annual precipitation totals range from 20 to 30 inches in the higher parts of the range above 3,000 feet. Most of the precipitation falls between November and March. The western (coastal) slope is generally moister than the eastern slope. Snow only falls in winter on the highest peaks. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Santa Ana Mountains」の詳細全文を読む スポンサード リンク
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