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Sunset in Avşa island

Avşa Island (Turkish: Avşa Adası) or Türkeli is a Turkish island in the southern Sea of Marmara with an area of about 14 square miles (36 square kilometres). It was the classical and Byzantine Aphousia (Greek: Αφουσία[dubious ]) or Ophiousa (Οφιούσα) and was a place of exile during the Byzantine period.

The island belongs to the Marmara District of Balıkesir Province in northwestern Turkey. It is a popular domestic tourist destination, especially for tourists from Istanbul. The local population is around 2,000 according to the last census, but during the summer season the number of visitors increases as far as forty to fifty thousand.


The island is within reach from Istanbul by ship and ferry. It is also accessible from Erdek and Tekirdağ by motorboat.


Geographical location of Avşa island.
Avşa island aerial view

The exact location of Avşa island is shown in the following map in red color. The larger island north of Avşa is the island of Marmara and the island to the east is Paşalimanı.

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Coordinates: 40°30′43″N 27°29′55″E / 40.51194°N 27.49861°E / 40.51194; 27.49861