El Cajon is a city in San Diego County, California, United States located 17 miles east of Downtown San Diego. In a valley surrounded by mountains, the city has acquired the nickname of "The Big Box." Its name originated similarly, from the Spanish phrase "el cajón," which means "the box" or "the drawer."

Like most inland areas in Southern California, the climate varies dramatically within a short distance, known as microclimate. El Cajon's climate has greater extremes compared to coastal San Diego. The farther east from the coast, the more arid the climate gets, until one reaches the mountains, where precipitation increases due to orographic uplift.

El Cajon is home to many annual community traditions. On a Saturday in May the city celebrates its diversity with a free family-friendly event called "America on Main Street". The festival replaces a previous city-sponsored event called the International Friendship Festival which ran from 1991 to 2003. Both festivals highlight the city's identity as a "mini-United Nations", with 30% of its population being immigrants from Iraq, Somalia, Syria, Turkey, and other countries. El Cajon's annual Mother Goose Parade has been held on the Sunday before Thanksgiving every year since 1946. Organizers claim it is the largest parade in San Diego County. It features more than 100 entries including "motorized floats, marching bands and drill units, equestrians, clowns, performing artists, giant helium balloons, specialty vehicles and Santa Claus."