Kasos Island is not a city, but a Greek island located in the southern part of the Aegean Sea. It is part of the Karpathos regional unit and is relatively small in size, with a population of about 1,000 people. The main settlement on the island is called Fry, which serves as the administrative center. Kasos is known for its traditional architecture, natural landscapes, and beautiful beaches. It is a popular destination for those looking for a peaceful and authentic Greek island experience.