Los Angeles , (Spanish for "the angels") is the largest city in the state of California and the second largest in the United States. Often abbreviated as L.A. and nicknamed The City of Angels, Los Angeles has an estimated population of 3.8 million and spans over 498.3 square miles (1,290.6 km2) in Southern California. Additionally, the Los Angeles Metropolitan Area is home to nearly 12.9 million residents. Los Angeles is the seat of Los Angeles County, the most populated and one of the most diverse counties in the United States. Its inhabitants are known as "Angelenos" . In 2008, Los Angeles was named the world's eighth most economically powerful city by Forbes.com, ahead of Shanghai and Toronto but behind Chicago and Paris.

Los Angeles was founded September 4, 1781, by Spanish governor Felipe de Neve as El Pueblo de Nuestra Señora la Reina de los Angeles del Río de Porciúncula (The Village of Our Lady, the Queen of the Angels of the river of Porziuncola). It became a part of Mexico in 1821, following its independence from Spain. In 1848, at the end of the Mexican-American War, Los Angeles and California were purchased as part of the Treaty of Guadalupe Hidalgo, thereby becoming part of the United States; Mexico retained the territory of Baja California. Los Angeles was incorporated as a municipality on April 4, 1850, five months before California achieved statehood.

Los Angeles is one of the world's centers of business, international trade, entertainment, culture, media, fashion, science, technology, and education. It is home to renowned institutions covering a broad range of professional and cultural fields, and is one of the most substantial economic engines within the United States. As the home base of Hollywood, it is known as the "Entertainment Capital of the World", leading the world in the creation of motion pictures, television production and recorded music. The importance of the entertainment business to the city has led many celebrities to call Los Angeles and its surrounding suburbs home.
Geography

Los Angeles is irregularly shaped and covers a total area of 498.3 square miles (1,291 km2), comprising 469.1 square miles (1,214.9 km2) of land and 29.2 square miles (75.7 km2) of water. The city extends for 44 miles (71 km) longitudinally and for 29 miles (47 km) latitudinally. The perimeter of the city is 342 miles (550 km). It is the only major city in the United States bisected by a mountain range.

The highest point in Los Angeles is Mount Lukens, also called Sister Elsie Peak. Located at the far reaches of the northeastern San Fernando Valley, it reaches a height of 5,080 ft (1,548 m). The hilliest parts of Los Angeles are the entire Santa Monica hills north of Downtown, areas immediately north of Downtown around Silver Lake, the entire eastern parts of L.A., the Crenshaw area, the San Pedro area, and northern parts of the San Fernando Valley. The major river is the Los Angeles River, which begins in the Canoga Park district of the city and is largely seasonal. The river is lined in concrete for almost its entire length as it flows through the city into nearby Vernon on its way to the Pacific Ocean.

Climate
Los Angeles has a Mediterranean climate or Dry-Summer Subtropical (Köppen climate classification Csb on the coast, Csa inland), and receives just enough annual precipitation to stay out of Köppen's BSh (warm semiarid) classification. Los Angeles enjoys plenty of sunshine throughout the year, with an average of 263 sunshine days and only 35 days with measurable precipitation annually.

The period of May through October is warm to hot and dry with average high temperatures of 74–84°F (24–29°C) and lows of 58–66°F (14–19°C), however temperatures frequently exceed 90°F (32°C) and occasionally reach 100°F (38°C) in inland areas (away from the moderating effect of the ocean).
The period of November through April is mild and somewhat rainy with average high temperatures of 68–73°F (20–23°C) and lows of 48–53°F (9–12°C), but temperatures could occasionally drop to low 40s (~5°C) or be as high as 80°F (26°C) for few days during winter.

The Los Angeles area is also subject to the phenomenon typical of a microclimate. As such, the temperatures can vary as much as 18°F (10°C) between inland areas and the coast, with a temperature gradient of over one degree per mile (1.6 km) from the coast inland. California has also a weather phenomenon called "June Gloom or May Grey", which sometimes gives overcast or foggy skies in the morning at the coast, but usually gives sunny skies by noon, during late spring and early summer.
Los Angeles averages 15 inches (385 mm) of precipitation annually, which mainly occurs during the winter and spring (November thru April) with generally light rain showers, but sometimes as heavy rainfall and thunderstorms. The coast gets slightly less rainfall, while the mountains get slightly more. Years of average rainfall are rare; the usual pattern is bimodal, with a short string of dry years (perhaps 7–8 inches/175–200 mm) followed by one or two wet years that make up the average. Snowfall is extremely rare in the city basin, but the mountains within city limits typically receive snowfall every winter. The greatest snowfall recorded in downtown Los Angeles was 2 inches (5 cm) in 1932.
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Cityscape
The city is divided into many neighborhoods, many of which were incorporated places or communities that were annexed by the city. There are also several independent cities around Los Angeles, but they are popularly grouped with the city of Los Angeles, either due to being completely engulfed as enclaves by Los Angeles, or lying within its immediate vicinity. Generally, the city is divided into the following areas: Downtown Los Angeles, Northeast – including Highland Park and Eagle Rock areas, the Eastside, South Los Angeles (still often colloquially referred to as South Central by locals), the Harbor Area, Hollywood, Wilshire, the Westside and the San Fernando and Crescenta Valleys.

Some well-known communities within Los Angeles include West Adams, Watts, Leimert Park, Baldwin Hills, Venice Beach, the Downtown Financial District, Los Feliz, Silver Lake, Hollywood, Koreatown, Westwood and the more affluent areas of Bel Air, Benedict Canyon, Hollywood Hills, Hancock Park, Pacific Palisades, Century City, and Brentwood.

Landmarks
Important landmarks in Los Angeles include Chinatown, Koreatown, Little Tokyo, Walt Disney Concert Hall, Kodak Theatre, Griffith Observatory, Getty Center, Los Angeles Memorial Coliseum, Los Angeles County Museum of Art, Grauman's Chinese Theatre, Hollywood Sign, Hollywood Boulevard, Capitol Records Tower, Los Angeles City Hall, Hollywood Bowl, Watts Towers, Staples Center, Dodger Stadium and La Placita Olvera/Olvera Street.