Chalcedon
The site of Chalcedon is located on a small peninsula on the north coast of the Sea of Marmara, near the mouth of the Bosphorus. A stream, called the Chalcis or Chalcedon in antiquity and now known as the Kurbağalıdere (Turkish: "stream with frogs"), flows into Fenerbahçe bay. There Greek colonists from Megara in Attica founded the settlement of Chalcedon in 685 BC, some seventeen years before Byzantium.
Chalkidiki
Chalcidice ( or ), Halkidiki, Chalkidiki, or Chalkidike, is the name given to this peninsula by a group of people native to this region, the Chalcideans (), since ancient times. The area was a colony ("apoikia") of the ancient Greek city-state of Chalkis.