It is known that Xanthos, whose history dates back to 3000 BC, was the most significant administrative center and capital of Lycia in ancient times. Letoon, included in the UNESCO World Heritage List in 1988 with Xanthos, is one of this period's most important religious centers.

Xanthos, where Sarpedon, who encouraged Prince Hector with the poem he wrote in the Trojan War, lived, is located in the east of the Muğla-Antalya provincial border separated by the Eşen Stream, within the boundaries of Antalya, near the town of Kınık. Letoon, on the other hand, is located just four to five kilometers west of Xanthos, within the borders of the Seydikemer district of Muğla.

Xanthos and Letoon are among the essential elements of world heritage in terms of their archaeological values. In these very close settlements are stone inscriptions where the most extended and crucial texts in the Lycian language can be seen.

Xanthos has the Xanthos Theatre with a capacity of 2200 people. This ancient theatre was built in the Hellenistic Period and renovated in the Roman Period. The square to the theatre's north, surrounded by entrances on all four sides, is the Roman Agora.