|⁃ location||Bayat Plateau|
|Length||824 km (512 mi)|
|Basin size||55,300 km2 (21,400 sq mi)|
|⁃ average||193 m3/s (6,800 cu ft/s)|
The Sakarya (Turkish: Sakarya Irma, Greek: , romanized: Sangarios) is the third longest river in Turkey. It runs through what in ancient times was known as Phrygia. It was considered one of the principal rivers of Asia Minor in antiquity, and is mentioned in the Iliad and in Theogony. Its name appears in different forms as Sagraphos,Sangaris, or Sagaris. This river had its sources on Mount Adoreus, near the town of Sangia in Phrygia, not far from the Galatian frontier, and flowed in a very tortuous course, first in an eastern, then in a northern, then in a northwestern, and lastly again in a northern direction through Bithynia into the Euxine. In one part of its course it formed the boundary between Phrygia and Bithynia; and in early times Bithynia was bounded on the east by the river. The Bithynian part of the river was navigable, and was celebrated from the abundance of fish found in it. Its principal tributaries were the Alander, Bathys, Thymbres, and Gallus.
The source of the river is the Bayat Yaylas? (Bayat Plateau) which is located to the northeast of Afyon. Joined by the Porsuk Çay? (Porsuk Creek) close by the town of Polatl?, the river runs through the Adapazar? Ovas? (Adapazar? Plains) before reaching the Black Sea. The Sakarya was once crossed by the Sangarius Bridge, constructed by the East Roman Emperor Justinian I (r. 527-565).
In 13th century, the valley of the Sakarya was part of the frontier of the Byzantine Empire and the home of the Sö?üt tribe. By 1280, Byzantine Emperor Michael VIII had constructed a series of fortifications along the river to control the area, but a 1302 flood changed the course of the river and made the fortifications useless. The Sö?üt tribe migrated across the river and went on to establish the Ottoman Empire.
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