Hotel keepers and shop owners in northwestern Turkey are having a field day as thousands of fans have flocked there to see the 658th Kırkpınar Oil Wrestling Festival. Held annually in the Edirne province since 1362, the weeklong festival -- one of the world's oldest sports events -- has recently emerged as a major tourist attraction in Turkey. Located close to the country's borders with Bulgaria and Greece, Edirne was once the capital of the Ottoman Empire. 'Lots of tourists come to see Edirne's cultural and historical sites, especially those from the Ottoman era,' Mustafa Kabak, a hotel employee, told Anadolu Agency on Saturday. 'But when the festival kicks off, it's a whole different story, as an incredible number of tourists arrive in the region.' 'The demand is so high during the Kirkpinar festival that it's almost impossible to find a single vacant room. In fact, there are local residents who leave the city and rent out their houses to tourists,' he added. Kabak, 33, said the festival has been a boon for the shop owners and hotel keepers in the province. 'We work really hard for the Kirkpinar event. It's well worth it.' Arif Uzun, 46, a taxi driver, said since this year's festival started he has seen a fourfold increase in demand.