ATHENS- Greece's south Aegean islands were marked 'dark red' on the European Centre for Disease Prevention and Control's COVID-19 map on Thursday after a rise in infections, meaning all but essential travel to and from the region is discouraged.

The cluster of 13 islands includes Greece's most popular destinations for foreign tourists - Mykonos, Santorini and Rhodes - which, combined, draw millions of people every summer.

The dark red zones on the ECDC map help distinguish very high-risk areas and also helps EU member states uphold rules requiring testing on departure and quarantine upon return.

(Reporting by Karolina Tagaris) ((karolina.tagaris@thomsonreuters.com; +30 210 3376 455;))