Canadian wildfires affecting parts of U.S.: What to know, where they are

Uncontrollable flames are ravaging swaths of Canadian forest in what authorities described as a “devastating” wildfire season that could become the worst the country has ever seen.

The United States’ northern neighbor is home to some of the world’s densest forests, and it experiences wildfires every year. But this year, the fires have been particularly widespread, numerous and intense, burning through more than 3.7 million acres in Canada.