France, which widened its heatwave red alert in the south of the country, said it would scale back production at a nuclear power plant as high temperatures curbed cooling water supply.
The strait, linking the Aegean Sea and the Black Sea, is a major shipping route for commodities such as oil and grains.
It said some areas of southern France would experience temperatures of 42 degree Celsius (108 degrees Fahrenheit).
The authorities widened a heatwave red alert for the south of the country, while officials urged some mountain climbers to postpone their activities and told grape pickers to work in the morning to avoid the extreme heat.
Italy issued heatwave red alerts about "emergency conditions" that the health ministry says could endanger the healthy as well as the frail in 17 of its 27 main cities for Wednesday and Thursday, including Rome, Milan, Florence and Venice.
Persons:
Firefighters, Vassilis Kikilias, herder, Saint Alban, Karolina Tagaris, Alexandros Avramidis, Ezgi, Zhifan Liu, Forrest Crellin, Nacho Doce, Violeta Santos Moura, Crispian Balmer, Charlie Devereux, Edmund Blair
Organizations:
Migration Ministry, Residents, Civil, European Union, EDF, Saint, Fundacion Madrina, Firefighters, Wednesday, Thomson
Locations:
Athens, Turkey, Dardanelles, France, Italy, ATHENS, ISTANBUL, Europe, Greece, Menidi, Amygdaleza, Fyli, Alexandroupolis, Evros, East, Asia, Turkey's, Canakkale, Meteo, Spain, Tenerife, Rome, Milan, Florence, Venice