MONTEREY COUNTY (BCN) — The Soberanes Fire in Monterey County is now at 51,200 acres and is 30 percent contained, Cal Fire officials reported Thursday morning.

The massive brush fire, caused by an abandoned campfire, broke out the morning of July 22.

The rugged terrain in the area has made it difficult for the more than 5,000 firefighters working to extinguish the blaze.

The fire started in the area of Soberanes Creek in Garrapata State Park, Cal Fire officials said.

Investigators have estimated the fire won’t be fully contained until the end of the month.