Some 7,500 firefighters wee battling to bring the flames under control, authorities said. Firefighters were also at work in the Boumerdes, Tizi Ouzou, Jijel and Skikda regions.
About 1,500 people had been evacuated.
A major heatwave has hit North African countries, with temperatures reaching 49 Celsius (120 F) in some Tunisian cities.