The ancient city of Theimiussa, now known as Üçağız Village, can be reached by the road leading south from the 20th kilometer of the Kaş-Demre highway. The ruins are located on the eastern side of the village where the houses begin to thin out. According to an inscription found there, Theimiussa was administratively a village settlement, not a city.

The fact that grave inscriptions indicate that fines for violent crimes were to be paid to Myra or Kyaneai suggests that it was a maritime unit connected to those cities. The first ruin is a miniature castle with rectangular walls with a bosage right on the shore. This castle was enlarged in the Byzantine period with a fortification wall, which may have preceded it, and was formed into a shape surrounding the city.

Where the city borders Tybersissos, there is an acropolis, also walled in the rectangular technique, which must have been considered together with Tybersissos as the last place to be defended. Going east from the pier, a little inland from the beach, there is a pair of rock tombs of the house type with a damaged entrance door. To the right of the tomb on the east side is a standing figure of a young man or child. A Lycian inscription above the door indicates that the owner of the tomb was Kluwanimi. Many Late Hellenistic and Roman sarcophagi are lined up around the canal built with cut stone walls on both sides to the east of the tomb building. At the northern end of the channel there is an early Byzantine building, the purpose of which is uncertain.

The ancient city of Theimiussa, now known as Üçağız Village, can be reached by the road leading south from the 20th kilometer of the Kaş-Demre highway. The ruins are located on the eastern side of the village where the houses begin to thin out. According to an inscription found there, Theimiussa was administratively a village settlement, not a city.