mouth_of_the_watercourse porsuk river
Eskiehir (" old ", " ehir " " city ", in Greek : " Dorylaeon ",  ) is a city in northwestern Turkey and the capital of the Eskiehir Province . The urban population of the city is 717 , 135 with a metropolitan population of 826 , 135 . The city is located on the banks of the Porsuk River , 792 m above ___MASK57___ level , where it overlooks the fertile Phrygian Valley . In the nearby hills one can find hot springs . The city is to the west of Ankara , to the southeast of Istanbul and to the northeast of Kütahya . Known as a university town , both Eskiehir Osmangazi University and Anadolu University ( which has one of the largest student enrollments in the world ) are based in Eskiehir . The province covers an area of . Eskiehir Province Eskiehir ' s province population is 844 , 842 . Eskiehir ' s urban population is 734 , 837 . Eskiehir is a province in northwestern Turkey . Its adjacent provinces are Bilecik to the northwest , Kütahya to the west , Afyon to the southwest , Konya to the south , Ankara to the east , and Bolu to the north . The provincial capital is Eskiehir . Most of the province is laid down in Central Anatolia Region . Northern parts of Mihalççk district and ones of Mihalgazi and Sarcakaya of her remained in Black ___MASK57___ Region and Han one of her remained in Aegean Region . Turkey , officially the Republic of Turkey ( Turkish : ), is a transcontinental country in Eurasia , mainly in Anatolia in Western Asia , with a smaller portion on the Balkan peninsula in Southeast Europe . Turkey is a democratic , secular , unitary , parliamentary republic with a diverse cultural heritage . Turkey is bordered by eight countries : Greece to the west ; Bulgaria to the northwest ; Georgia to the northeast ; Armenia , the Azerbaijani exclave of Nakhchivan and Iran to the east ; and Iraq and Syria to the south . The ___MASK67___ is to the west , the Black Sea to the north , and the Mediterranean Sea to the south . The Bosphorus , the Sea of Marmara , and the Dardanelles , which together form the Turkish Straits , divide Thrace and Anatolia ; they also separate Europe and Asia . Turkey ' s location has given it geopolitical and strategic importance throughout history . Kütahya is a city in western Turkey with 237 , 804 inhabitants ( 2011 estimate ), lying on the Porsuk river , at 969 metres above ___MASK57___ level . It is the capital of Kütahya Province , inhabited by some 564 294 people ( 2011 estimate ). The region of Kütahya has large areas of gentle slopes with agricultural land culminating in high mountain ridges to the north and west . The city ' s Greek name was Kotyaion , Latinized in Roman times as Cotyaeum . A ___MASK57___ is a large body of salt water that is surrounded in whole or in part by land . More broadly , " the ___MASK57___ " is the interconnected system of Earth ' s salty , oceanic waters  considered as one global ocean or as several principal oceanic divisions . The ___MASK57___ moderates Earth ' s climate and has important roles in the water cycle , carbon cycle , and nitrogen cycle . Although the ___MASK57___ has been traveled and explored since prehistory , the modern scientific study of the ___MASK57___  oceanography  dates broadly to the British " Challenger " expedition of the 1870s . The ___MASK57___ is conventionally divided into up to five large oceanic sections  including the International Hydrographic Organization ' s four named oceans ( the Atlantic , Pacific , Indian , and Arctic ) and the ___MASK7___ ; smaller , second - order sections , such as the Mediterranean , are known as " seas ". An ocean ( the ___MASK57___ of classical antiquity ) is a body of saline water that composes much of a planet ' s hydrosphere . On Earth , an ocean is one of the major conventional divisions of the World Ocean , which covers almost 71 % of its surface . These are , in descending order by area , the Pacific , Atlantic , Indian , Southern ( Antarctic ), and Arctic Oceans . The word " ___MASK57___ " is often used interchangeably with " ocean " in American English but , strictly speaking , a ___MASK57___ is a body of saline water ( generally a division of the world ocean ) partly or fully enclosed by land . A river is a natural flowing watercourse , usually freshwater , flowing towards an ocean , ___MASK57___ , lake or another river . In some cases a river flows into the ground and becomes dry at the end of its course without reaching another body of water . Small rivers can be referred to using names such as stream , creek , brook , rivulet , and rill . There are no official definitions for the generic term river as applied to geographic features , although in some countries or communities a stream is defined by its size . Many names for small rivers are specific to geographic location ; examples are " run " in some parts of the United States , " burn " in Scotland and northeast England , and " beck " in northern England . Sometimes a river is defined as being larger than a creek , but not always : the language is vague . In antiquity , Phrygia was a kingdom in the west central part of Anatolia , in what is now Turkey , centered on the ___MASK18___ . The Porsuk River also Kocasu - Porsuk River ( Turkish : Porsuk Çay , Kocasu - Porsuk Çay ) is a Turkish river , that flows for 448 km . The city of Eskiehir is sited on the banks of this river . The river is dammed by the Porsuk I dam and Porsuk II dam forming large reservoirs . Istanbul ( or ), historically known as Constantinople and Byzantium , is the most populous city in Turkey and the country ' s economic , cultural , and historic center . Istanbul is a transcontinental city in Eurasia , straddling the Bosphorus strait ( which separates Europe and Asia ) between the ___MASK54___ and the Black Sea . Its commercial and historical center lies on the European side and about a third of its population lives on the Asian side . The city is the administrative center of the Istanbul Metropolitan Municipality ( coterminous with Istanbul Province ), both hosting a population of around 14 . 7 million residents . Istanbul is one of the world ' s most populous cities and ranks as the world ' s 7th - largest city proper and the largest European city .