SANTA ANA, Calif. — A wildfire in Southern California was 20 percent contained on Sunday but more than 200 homes remained evacuated near the Cleveland National Forest, authorities said.

More than 1,000 firefighters and fire personnel were battling the 2-square mile blaze that broke out Friday in Orange County’s Silverado Canyon.

Six firefighters have suffered minor injuries, many of them heat-related as temperatures reach triple digits, said Orange County Fire Authority Capt. Steve Concialdi.

“It’s extremely rugged terrain and another extremely hot day,” Concialdi said.

A heat wave is expected to last through Tuesday in Southern California, and a smoke advisory was in effect for parts of Riverside and Orange counties. The Cleveland National Forest sprawls over the rugged peaks of the Santa Ana Mountains, straddling the Orange and Riverside county line southeast of Los Angeles.

In Northern California, a 250-acre wildfire in the Sierra Nevada foothills has destroyed two homes, and three outbuildings, said Daniel Berlant, spokesman for the California Department of Forestry and Fire Protection.

The fire about halfway between Sacramento and Reno was 20 percent contained late Saturday.

The burned homes were in Alta Sierra, a community of some 6,000 people about 5 miles south of Grass Valley.