Sakarya (Turkish: Sakarya ili) is a province in Turkey, located on the coast of Black Sea. The Sakarya River creates a webbing of estuaries in the province.
Sakarya is located in the Marmara Region. Its adjacent provinces are Kocaeli to the west, Bilecik to the south, Bolu to the southeast, and Düzce to the east. The capital of Sakarya is Adapazarı. The climate is oceanic due to its close proximity to the Black Sea.
Sakarya is situated on the Ankara-Istanbul Highway. It is connected through both road and rail. Sakarya is serviced by Istanbul's Sabiha Gökçen International Airport airport.The current mayor of Sakarya is Zeki Tocoglu (AKP).
Sakarya dates back to 378 BC. Ancient settlers included Phrygians, Bithynians, Cimmerians, Lydians and Persians, but Sakarya got its identity from the Romans and Byzantine rulers. One of the most important remains of historical significance is the Justinianus Bridge (Turkish: Beş Köprü) built by Byzantine Emperor Justinian in 533 CE.
Districts of the Sakarya Metropolitan Municipality in bold.
Coordinates: 40°41′50″N 30°27′24″E / 40.69722°N 30.45667°E