The *big* challenge, the Hong Kong 4 Trails Ultra Challenge starts in just over 10 hours.
From a few years ago, but this explainer still good.
https://www.scmp.com/sport/outdoor/trail-running/article/3162433/what-298km-hong-kong-four-trails-ultra-challenge-and
From a few years ago, but this explainer still good.
https://www.scmp.com/sport/outdoor/trail-running/article/3162433/what-298km-hong-kong-four-trails-ultra-challenge-and
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