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.
Sigeion
Sigeion (Ancient Greek: , "Sigeion"; Latin: "Sigeum") was an ancient Greek city in the north-west of the Troad region of Anatolia located at the mouth of the Scamander (the modern Karamenderes River). Sigeion commanded a ridge between the Aegean Sea and the Scamander which is now known as Yenişehir and is a part of the Çanakkale district in Çanakkale province, Turkey. The surrounding region was referred to as the Sigean Promonotory, which was frequently used as a point of reference by ancient geographers since it marked the mouth of the Hellespont. The outline of this promontory is no longer visible due to the alluvial activity of the Karamenderes which has filled in the embayment east of Yenişehir. The name 'Sigeion' means 'silent place' and is derived from Ancient Greek ("sigē"), 'silence'; in Classical Antiquity, the name was assumed to be antiphrastic, i.e. indicating a characteristic of the place contrary to reality, since the seas in this region are known for their fierce storms.