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.
Apollonos Hieron
The inhabitants of the village of Buldan hold that their town is the location, of Apollonos Hieron. However, Buldan is known to be the site of Tripolis, and both cities sent separate delegates to the Council of Chalcedon. Ramsay believed that both cities were adjacent to each other and this may explain why Pliny thought the name of Tripolis had previously been Apollonos. He more generally puts it in the Plain of Philadelphia, in the Lykos River Valley,