Step 1 : Introduction to the question "Which city is located on two continents?"
Istanbul, Turkey is the only major city in the world located on two continents - Europe and Asia. Istanbul once known as Constantinople, is the most populous city in Turkey, and the country's economic, cultural, and historical center. Due to the nebulous nature of the boundaries between Europe and Asia, Istanbul is the only naturally occurring transcontinental city. The Bosphorus strait separates its continental European and Asian portions. Istanbul is Turkey’s largest city and has roughly 65% of its citizens residing on the European side, while the remainder live on the geographically Asian side of the strait.