Chios is the fifth largest island of the Greek islands (842 sq. km.) with a 213 km coastline and a population of approximately 50,000 inhabitants who live in the capital as well as within the the 64 villages.

It is situated in the furthest eastern portion of the Aegean Sea, just a few nautical miles off the Turkish shore of Asia Minor.

Cape Pounda in Turkey and the peninsula of Erythraia where Tsesme is, are only 3.5 nautical miles away.