Decathlon Büyükada Half Marathon

Istanbul will turn island life into a running experience on September 27, 2026, as the Decathlon Büyükada Half Marathon brings runners to the largest of the Princes’ Islands. With 21K Half Marathon, 10K, and 5K options, the event will offer a road-running day shaped by sea air, island roads, changing elevation, and the calm rhythm of Büyükada.

The 5K course will offer a short and accessible asphalt route with climbs and descents, making it a strong option for runners who want to enjoy the race atmosphere without taking on a longer distance. The 10K course will keep speed at the center, even with the island’s natural ups and downs. The 21K Half Marathon will cover the official half marathon distance of 21.0975K, completed over two laps, asking runners to manage their energy carefully across the full race.

Büyükada will make the day feel far more than a race. Visitors can arrive by ferry, walk along the waterfront, explore historic mansions, follow the pine-lined roads, visit Aya Yorgi, or take in the quiet views around the island. After the finish, the day can continue with seafood, mezes, island ice cream, coffee by the sea, and that soft September light only the Princes’ Islands can give. Even if you are not running, you will still want to be here—because Büyükada turns a road race into an island escape where sea air, historic streets, ferry views, and finish-line energy move together.