Comrades Marathon (South Africa)

Comrades Marathon is the world's oldest ultramarathon, with 87 kilometers alternating between 'up' and 'down' runs from Durban to Pietermaritzburg. Elevation gain hits 1,600 meters in the 'up' run, while the 'down' run averages 50% faster splits, creating a unique challenge that surpasses Tokyo Marathon's flat course in both distance and cutthroat timing.