The heat wave began on Sunday and could "last nine or ten days, which would make it one of the three longest heat waves Spain has seen since 1975," Spain's meteorological agency AEMET says.
From the Northeast through the Midwest, temperatures soared near triple digits.
The blaze was spotted on Saturday night in the Moguer region near Huelva and was being treated as a level 1 - or maximum threat - by emergency services.
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