|By Josep Renalias (Own work) [CC-BY-SA-3.0], via Wikimedia Commons|
Located on both sides of the Bosphorus, the narrow strait between the Black Sea and the Marmara Sea, Istanbul bridges Asia and Europe both physically and culturally. Istanbul's population is estimated to be between 12 and 19 million people, making it also one of the largest in Europe and the world.
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Offline version of this walk for your iPhone you can get via PinMyWAY app.