The İstanbul Marathon is an event which is organized yearly by the metropolitan municipality in Istanbul. This marathon, the only one in the world that crosses two continents, occurs usually on a Sunday in November.
İt starts on the Asian side of the city, shortly before the Bosphorus Bridge, crosses the bridge giving an amazing view of the Bosphorus and Istanbul, passes many historic sites including the Blue Mosque and Hagia Sophia, and ends in the İnönü Stadium in the European part. The race crosses three bridges, one over the Bosporus and two over the Golden Horn.
To register for the marathon, participants must be 18 years of age or older on the race day. You can register online on: http://www.istanbulmarathon.org/en
The registration close one and half months before the marathon itself, so for 2015, you’ll be probably able to register until 30th September 2015.