Büyük Ilyosta Island

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 39.32667°N, 26.53722°W 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 1 km2. Its distance to main land (Anatolia) is about 6.5 km and to Greek island Lesbos is 9.5 km. The sea around the island is a popular diving spot.