Bosphorus ( Boğaziçi in Turkish) seperates European istanbul from Asian Istanbul. Istanbul is surrounded with Black Sea at the north and Marmara Sea at the south. Here Bosphorus is the sea flow of these two seas.
The Boshporus strait separates Istanbul's Asian and European sides.
The Ural Mountains separates European Russia from Asian Russia. A picture is included in the link below.
Of course not, it is the same country, Do you need passport to go to California from New York?
The sea of marmara is considered the smallest sea which separates turkey's Asian and European parts.
The water passageway that leads to the Black Sea through Turkey is the Bosporus or Istanbul Strait. It separates the European part of Turkey from the Asian part.
You might be thinking of the Bosphorus Strait (not "straight"). It's the water that divides Istanbul (and therefore, Turkey) into its European side and its Asian side.
"Hellespont" is the ancient name for the Dardanelles, which is a strait that separates Asian Turkey from the Gallipoli peninsula of European Turkey, and links the Aegean Sea with the Sea of Marmara.
European and Asian; one parent is European, the other Asian.
There is no any mountain in Istanbul although there are many hills. The highest point of Istanbul is the Aydos Hill, there is on the Asian side of the city on Kartal District which is 537 metres high.
Cultural AnswerBeauty is in the eye of a beholder though?Who sees european and asian characteristics of Turkey as a separating aspect?For Turkish people there is no separation but unification of unique character; being both Asian and European, western and eastern in one entity.So, may be you have to check where do you see separation to your eyes.Geographic AnswerEuropean and Asian Turkey are separated by three bodies of water, from north to south:Bosporus Strait which starts at the Black Sea on Turkey's northern coast and then runs down through Istanbul at its southern end (separating neighborhoods like Sultanahmet and Beyoğlu on the European side from Üsküdar).Sea of Marmara which is a small sea between Istanbul and the Gallipoli Peninsula. The island of Marmara in the sea was used by Romans as a marble quarry. Since Marmara is the Latin word for marble, the term was applied to island and the sea in general. Europe is to the north and west of the Sea of Marmara and Asia is to south and west.Dardanelles Strait which starts at the Sea of Marmara as it narrows between Anatolia and the Gallipoli Peninsula and then runs down to the city of Çanakkale on the Aegean Sea.
The Ural Mountains in eastern Russia are generally considered the dividing line between the regions arbitrarily assigned to either continent.
The Bosporus (or Bosphorus) is a strait, a narrow passage of water between two large landmasses, that separates the European section of Turkey from the Asian section. See the link for more details.