Santiago Canyon Fire of 1889 ( previously called the '' Great Fire of 1889 '' ) was a massive wildfire in California , which burned large parts of Orange County , Riverside County , and San Diego County during the last week of September 1889 . Until 2018 , it was possibly the single largest wildfire in the recorded history of California , with at least of land burned . In mid-August 2018 , the Ranch Fire in the Mendocino Complex Fire surpassed the Santiago Canyon Fire in size
Mendocino Complex Fire
Mendocino Complex Fire
Santiago Canyon Fire