Kapıdağ Peninsula in the context of "Cyzicus"

Biga Peninsula (Turkish: Biga Yarımadası) is a peninsula in Turkey, in the northwest part of Anatolia. It is also known by its ancient name Troad (Troas).

The peninsula is bounded by the Dardanelles Strait and the southwest coast of the Marmara Sea to the north, Aegean Sea to the west and the Edremit gulf to the South. The eastern border of the peninsula is Gönen creek close to Kapıdağ Peninsula. Cape Baba at 39°28′46″N 26°03′49″E / 39.47944°N 26.06361°E / 39.47944; 26.06361 is the westernmost point of Anatolia The main mountain of the peninsula is Kaz Mountain (Mount Ida of the antiquity). Among the seven rivers or creeks, Karamenderes River (Scamander of the antiquity) and Biga River (Granikos of the antiquity) are the longest. Karamenderes discharges to Dardanelles Strait and Biga River discharges to the Marmara Sea.

Erdek is a municipality and district of Balıkesir Province, Turkey. Its area is 307 km, and its population is 32,021 (2024). Located on the Kapıdağ Peninsula, on the north coast of the Gulf of Erdek at the south of the Sea of Marmara, Erdek is a popular domestic holiday destination with several hotels dating back to the 1960s. The surrounding area has a rugged geology and topography with evergreen wooded areas and large olive groves. It is dominated by Mt Dindymus (782m). Erdek district also included the islands of Koyun and Paşalimanı.

In the summer ferries travel from Erdek to Avşa Adası, one of the Marmara Islands in the Sea of Marmara. The harbour overlooks tiny Zeytinlik island where there is a research station devoted to olives.

Erdek Gulf is a gulf of Marmara Sea, Turkey. It is administratively a part of Balıkesir Province.In fact, the gulf is named after Erdek, an ilçe (district) of the Balıkesir Province which is situated at the north coast of the gulf .The midpoint of the gulf is at about 40°22′N 27°40′E / 40.367°N 27.667°E / 40.367; 27.667. Kapıdağ Peninsula, Paşalimanı Island and Avşa Island are to the north, Belkıs Tombolo (connecting Kapıdağ Peninsula to the Anatolia mainland) is to the east, Karabiga ilçe is to the west and the Marmara coast of Anatolia is to the south. The maximum depth of the gulf is 47 metres (154 ft).

There are ferry services in the gulf. One service is to Barbaros in the Thracen side of Turkey, close to Tekirdağ. There are also ferry services to the nearby islands such as Marmara Island (Saraylar terminal), Avşa Island and the Paşalimanı Island.