The Biga River () 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 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)"Republic of Turkey 2002" NW quadrant, CIA Map Number 802565, July 2002, U.S. Central Intelligence Agency and the Kocabaş (Kocabaş Çayı).

The Biga was the classical Granicus (, Granikòs Potamós). Cephalon (FGrHist 45 F 5.) wrote that the river named after Graecus (Γραικός).Stephanus of Byzantium, Ethnica, p.435, 107

The banks near the modern-day town of Biga were the site of the Battle of the Granicus, fought in 334 BC between the Macedonian army of Alexander the Great and the forces of the Persian Empire of Darius III. This was Alexander's first victory over the Persians. In antiquity, the river was described as having strong, turbulent current, with steep banks and varying depth.

There is also a valley named in its honor on Mars. The Granicus Valles is at 29.72° N, 131.0° E and runs for .

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References

External links Livius.org: Granicus - pictures of the stream A map showing the River Biga