Firefighters in Spain, Portugal and Greece battled ongoing wildfires Friday, an important religious holiday in all three countries, as persistent hot, dry conditions challenged efforts to contain the blazes.

The fires in Spain this year have burned 158,000 hectares or 610 square miles, according to the European Union’s European Forest Fire Information System. That is an area roughly as big as metropolitan London.

Firefighters are battling several wildfires in Greece as a scorching heatwave wreaks havoc across southern Europe. In the past 24 hours alone, more than 152 new fires have broken out across Greece - and thousands of people have been evacuated. Around 4,850 firefighters are engaged in a multi-front battle to contain the flames.