Yumurtalık Island (also known as Atlas Island) is a small Mediterranean island in Yumurtalık ilçe (district) of Adana Province, Turkey. The midpoint of the island is at . It is situated about to the east of the port.
Its surface area is about . There is a small castle in the north of the island. The castle was built in the 11th century,Faz Turkey page during the late Byzantine or Cilician Armenia era. It faces the castle in the main land (Aegeae). It was an auxiliary unit of the port.Adana coast page
Sometimes the island is also called Kızkalesi with the very same story of the Kızkalesi (castle) in Mersin Province.
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