Denizli Province is a province and metropolitan municipality of Turkey in Western Anatolia, on high ground above the Aegean coast. Neighbouring provinces are Uşak to the north, Burdur, Isparta, Afyon to the east, Aydın, Manisa to the west and Muğla to the south. It is located between the coordinates 28° 30’ and 29° 30’ E and 37° 12’ and 38° 12’ N. Its area is 12,134 km2, and its population is 1,056,332 (2022). The provincial capital is the city of Denizli.

Aydın Province is a province and metropolitan municipality of southwestern Turkey, located in the Aegean Region. Its area is 8,116 km2, and its population is 1,148,241 (2022). The provincial capital is the city of Aydın. Other towns in the province include the summer seaside resorts of Didim and Kuşadası.