Raging wildfires in Spain spread to the southern slopes of the Picos de Europa mountain range on Monday, and authorities closed part of the popular Camino de Santiago pilgrimage route.

Up to 20 major wildfires are burning in total, the majority in Spain's northwestern region of Galicia, while there are several blazes in neighbouring Portugal.

Spain continues to battle major wildfires on Sunday, especially in the north-western Galicia region where blazes have torn through parched forests for more than a week.

Spain's worst wave of wildfires on record spread to the southern slopes of the Picos de Europa mountains on Monday and prompted authorities to close part of the popular Camino de Santiago pilgrimage route.

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A heatwave is continuing to affect the Iberian Peninsula. Thousands of firefighters have been deployed to battle ongoing blazes and towns have been evacuated. Spanish Prime Minister Pedro Sánchez visited affected regions to meet with the heads of emergency teams.

The European Commission is deploying firefighting aircraft to Spain, where at least seven have died as 14 wildfires have flared amid a European heat wave.

A second volunteer firefighter has died after battling a wildfire in the northern Spanish province of Leon, while police arrested a man for allegedly starting a separate blaze as the country faced one of its worst summers for fires in 20 years.