Firefighters work to extinguish a fire that scorched 21 acres at Irvine Regional Park in Orange on Sunday, July 5. Investigators believe the blaze may have been sparked by fireworks.

Santiago Oaks Regional Park, seen here on Sunday, March 7, 2021, brings in mountain bikers, hikers, horses and allows dogs on a leash in Orange, CA. The park connects to Irvine Regional Park and ...

The then-160-acre park was called Orange County Park, but its name was officially named for its donors in 1928. On Oct. 1, Irvine Regional Park will mark 125 years since its founding.