The Kastellorizo-Kaş swim (Αγώνας κολύμβησης Καστελλορίζου-Αντιφέλλου,Turkish: Uluslararası Meis Kaş Yüzme Yarışması) is an international cross-border open water swimming competition between the Greek island of Kastellorizo or Megisti (Μεγίστη) and the village of Kaş (Αντίφελλος) in the county of Antalya ( Επαρχία Ατταλείας). It has been held since 2005 annually in June to promote the friendship between the two neighboring countries.
The swimming competition is part of the International Lycia-Kaş Culture and Art Festival, which ls being held since late 1990s. The distance of the course in the Mediterranean Sea is . The race begins at the Kastellorizo harbour and ends in the harbour of Antifellos. Participants must be at least 18 years of age, and must be able to swim 1,500 m in less than 30 minutes. The competitors undergo a health examination administered by a physician before the event.
In 2019, 180 swimmers from 12 nations, including 33 women, took part in the competition. The course record was set in 2019 by the Turkish 20-year-old woman Nilay Erkal with a time of 1 hour and 32 minutes, who improved her own record by five minutes, and was the winner of the competition in the last three years.