Istanbul is the largest city in what country?

Answer 1

Turkey is the country you're looking for, although Istanbul is not the capital of said country; Ankara is.

Answer 2

Istanbul was the capital city of Ottoman Empire. Under the name Constantinople, it was the capital city for Roman and Byzantine Empire, beginning with Constantine the Great.

When the empire became the nation of Turkey after World War I, the capital was relocated to Ankara (in Anatolia, or eastern Turkey).

Answer 3

1. Istanbul is the capital of Turkey.

2. Istanbul is on the coasts of the Marmara Sea.

Answer 4

Turkey.