Athens, Crete and the southern Aegean area among the top five areas dominating Greece's tourism map, according to study published by the Institute of Tourism Research and Forecasts (ITEP).
ITEP said that the other areas in the country's top five destinations, which draw 85% of Greece's tourists every year, are central Macedonia and the Ionian islands.
The gap between these five areas and the rest of the country is widening, said the study.
The country's tourism sector has been performing strongly in the last few years helping support Greece's economy that is emerging from an eight year downturn. However, the increased flow of visitors to Greece has not helped the sector do business beyond the traditional June to September period.
During these months, 80% of tourists visited Greece in the last two years, added the study.