San Diego is the second largest city in the U.S. state of California. It is at the southwest corner of California, as well as the southwest corner of the continental United States. It was founded in 1769 and is the oldest city in California.
It has nice weather most of the year. There are many military bases in and near San Diego. It has a lot of Pacific Ocean beaches. The San Diego Zoo is very famous.
San Diego is on the border between the United States and Mexico. The city of Tijuana is just across the border in Mexico.
San Diego is home to the San Diego Chargers football team and the San Diego Padres baseball team.