A total of 130 square kilometres have been charred, mainly in sparsely populated rural areas, according to the National Emergency Office.
Although most of 150 fires that broke out this summer season were under control or extinguished, 48 are still raging.
Three firefighters have died and another three were wounded battling the flames.
Soldiers and dozens of aircraft have been brought in to help.
Bachelet scrapped a trip to the Dominican Republic for a summit of Latin American and Caribbean leaders in order to oversee the official response.
Mexico and Argentina responded to an international call for assistance from Santiago by lending fire fighters.
In the central regions of O’Higgins and El Maule, the fires were considered the worst in the past 50 years, and a “state of catastrophe” has been declared for them.
Fires are common in Chile’s parched woods during summer. Most are caused by human activity.
But this year was considered worse because of a drought that has built up over the past eight years, attributed to climate change. A 10-day run of high temperatures also contributed.
“What is obvious is that Chile is facing nature that is stressed, and that is why each time there are conditions for forest fires, and they are growing in a dangerous fashion,” said Matias Asun, the country director of the environmental group Greenpeace.
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