the mendocino complex fire is  a large complex of two wildfires, the river fire and ranch fire, currently burning in mendocino, lake, and colusa counties in the u.s. state of california. it is th largest fire complex in recorded us history. the ranch fire is currently burning eight miles northeast of ukiah and the river fire is currently burning six miles north of hopland. the fires were first reported on  july 27, 2018. both fires have burned a combined total of . several communities and cities in the region had to be evacuated.