Erdek is a peninsule that extends towards the middle of the Marmara Sea; it is a holiday area that offers exciting holiday oppurtunities, thanks to the trekking and cycling paths in the Kapidag forest, as well as its long shores and temperate climate.

Erdek is also the name of a small and pleasant town on the south-western coast of the peninsula, with a port that is sheltered from northerly winds. The pebbly shore that gets deep at a very short distance makes it possible for ships to moor very near to the shore.

For years Erdek has been an important resort for domestic tourism, and is favorite destination, especially for the inhabitants of Ankara and Eskisehir. The hotels are stung along the five kilometer long open beach, but are concentrated especially in the Cugra and Kumluyali areas.