The Maratona dles Dolomites (Dolomites Marathon), is an annual single-day road bicycle race covering seven spectacular mountain passes in the Dolomites. Open to amateur cyclists, the Maratona—with 9,000 riders from over 40 nations—is one of the biggest Italian Granfondo bicycle races.National Geographic described it as "one of the biggest, most passionate, and most chaotic bike races on Earth.