Los Angeles, officially the City of Los Angeles and often known by its initials L.A., is the most populous city in California, the second most populous city in the United States, after New York City, and the third most populous city in North America. With an estimated population of nearly four million, Los Angeles is the cultural, financial, and commercial center of Southern California. The city is known for its Mediterranean climate, ethnic diversity, Hollywood and the entertainment industry, and its sprawling metropolis. Los Angeles is the largest city on the West Coast of North America.
Los Angeles is in a large basin bounded by the Pacific Ocean on one side and by mountains as high as 10,000 feet (3,000 m) on the other. The city proper, which covers about 469 square miles (1,210 km2), is the seat of Los Angeles County, the most populated county in the country. Los Angeles is also the principal city of the Los Angeles metropolitan area, the second largest in the United States after that of New York City, with a population of 13.1 million. It is part of the Los Angeles-Long Beach combined statistical area, also the nation’s second most populous area with a 2015 estimated population of 18.7 million.