San Carlos is a neighborhood in the eastern area of San Diego, California. It borders the neighborhoods of Del Cerro, Tierrasanta, and Allied Gardens, the city of La Mesa, and Mission Trails Regional Park. The “jewel” of San Carlos is Cowles Mountain. San Carlos is geographically defined largely by its proximity to Mission Trails Regional Park, and to the manmade reservoir Lake Murray (California). The area consists primarily of single-family homes. The neighborhood is served by the San Diego Unified School District.