It can be hard to get a sense of just how much of the state those splotches take up, so here's a rough idea. CAL Fire estimates how many acres have burned each year, both in their own jurisdictions and those covered by the U.S. Forest Service. If we add up the total acreage from 2013 through 2018 we get 5,395,088 acres. California itself is about 100 million acres, which means that roughly 5.4 percent of the state has burned just in the past five years. That may not sound like that much, but as the map shows, the same areas tend to get hit again and again. Parts of the state are complete desert, while others are snowy mountains, so it's the bits in between that tend to see fires. And unfortunately, that's also where the people tend to live.