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MB2M (meaning "Mountain-Bearing and Marsh-Crossing") is a large-scale Chinese sporting event hosted annually since 1999. The event consists of a three-day, two-stage marathon that covers a total of more than 100 kilometers, following scenic routes and traversing mountains, rivers, and lakes. Participants must conquer rigorous terrain, altitude, and distances. It is usually held from October to November in the wild nature of Luguangshan, Yunnan, China.