Mount Ida (Turkey) in the context of "Eumenes I"

The Troad (/ˈtroʊˌæd/ or /ˈtroʊəd/; Greek: Τρωάδα, Troáda) or Troas (/ˈtroʊəs/; Ancient Greek: Τρῳάς, Trōiás or Τρωϊάς, Trōïás) is a historical region in northwestern Anatolia. It corresponds with the Biga Peninsula (Turkish: Biga Yarımadası) in the Çanakkale Province of modern Turkey. Bounded by the Dardanelles to the northwest, by the Aegean Sea to the west and separated from the rest of Anatolia by the massif that forms Mount Ida, the Troad is drained by two main rivers, the Scamander (Karamenderes) and the Simoeis, which join at the area containing the ruins of Troy.

In Greek mythology, two sacred mountains are called Mount Ida, the "Mountain of the Goddess": Mount Ida in Crete, and Mount Ida in the ancient Troad region of western Anatolia (in modern-day Turkey), which was also known as the Phrygian Ida in classical antiquity and is mentioned in the Iliad of Homer and the Aeneid of Virgil. Both are associated with the mother goddess in the deepest layers of pre-Greek myth, in that Mount Ida in Anatolia was sacred to Cybele, who is sometimes called Mater Idaea ("Idaean Mother"), while Rhea, often identified with Cybele, put the infant Zeus to nurse with Amaltheia at Mount Ida in Crete. Thereafter, his birthplace was sacred to Zeus, the king and father of Greek gods and goddesses.

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.

Karamenderes is a river located entirely within the Çanakkale Province of Turkey. It flows west from Mount Ida and empties into the Aegean Sea near the Troy Historical National Park. According to the Iliad, the battles of the Trojan War were fought in the lower courses of Karamenderes.

Known in antiquity as Scamander, Scamandrus or Skamandros (Ancient Greek: Σκάμανδρος), it was according to Homer called Xanthus or Xanthos (Ξάνθος) by the gods and Scamander by men; though it probably owed the name Xanthus to the yellow or brownish colour of its water. Notwithstanding this distinct declaration of the poet that the two names belonged to the same river, Pliny the Elder mentions the Xanthus and Scamander as two distinct rivers, and describes the former as flowing into the Portus Achaeorum, after having joined the Simoeis.

The Biga River (Turkish: Biga Çayı) is a small river in Çanakkale Province in northwestern Turkey. The river begins at the base of Mount Ida and trends generally northeasterly to the Sea of Marmara. It is about 50 kilometres (31 mi) east of the Dardanelles. It flows past the towns of Çan and Biga and enters the Sea of Marmara at Karabiga. It is also known as the Çan (Çan Çayı) and the Kocabaş (Kocabaş Çayı).

The Biga was the classical Granicus (Ancient Greek: Γρανικὸς ποταμός, Granikòs Potamós).