Fast-moving flames, fanned by strong winds, are approaching Athens while the Dardanelles was temporarily shut to shipping.
A least two people have died and two others are reported to have died after wildfires tore across southern Europe.
Fast-moving flames, fanned by strong winds, crossed scrub-covered hillsides in the Keratea region of Greece, getting close to residential areas around 25 miles southeast of Athens on Friday.
One man was found dead in Keratea during an evacuation, the Fire Service said.
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Two Vietnamese tourists died after falling in the water amid strong winds on the tourist island of Milos in the Cyclades, France24.com said, quoting the Coastguard.
Authorities said 190 firefighters, using planes and helicopters to drop water, battled the blazes as thick clouds of black smoke filled the sky.
Wildfires in neighbouring Turkey forced the temporary closure of the Dardanelles Strait to shipping because of heavy smoke and reduced visibility in the narrow waterway.
A university campus and a care home for the elderly in northwestern Turkey were evacuated by authorities after another fire, which started in a field near Saricaeli village, in Canakkale province, quickly spread to a nearby forested area.
