Pydnai was probably once a small naval and military base fortress and guarded the very west end of Patara. The marshy area around it was once a bay and was probably a deep water harbour. It is made of well-preserved polygonal masonry with 11 rectangular towers at its corners and mid-way along the walls. It also has 7 protruding stairways which allowed soldiers to quickly scale its walls from the inside. Battlements were later added on upper walls. The only sign of construction within the walls is a small church.
Four or five inscriptions have been found in and around the fort; all are of Imperial date and one links Pydnai with Xanthos.
This site is found on the section of the Lycian Way walk near Gavurağili.