Büyük Ilyosta Island (literally "Great Ilyosta Island", also called Güneş Island ("Sun Island") is an Aegean island of Turkey. The name of the island is a changed form of the Greek name Eleos.
The island at is a part of Ayvalık ilçe (district) of Balıkesir Province. Although the name of the island has the modifier "great", it is actually a medium size island of about . Its distance to main land (Anatolia) is about and to Greek island Lesbos is . The sea around the island is a popular diving spot.
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