Marmara Adası, ancient Prokonnesos, is an island in the Sea of Marmara, north-western Turkey, 110 km south-west of Istanbul. In antiquity the island was a famous source of white marble, quarried was quarried along its northern side, especially around the harbour at Saraylar. This was the largest quarrying district in the Roman world, covering almost 40km². The accessibility of the quarries by sea made them a popular source of marble for building but also for sarcophagus and statue production. The island remains an important quarrying centre today.
