"X" typically symbolises the unknown, infinity, obscurity, and always evokes an intriguing mysterious atmosphere. TRAIL X is centered around Cloudy Hill in the northern New Territories. The TRAIL X course challenges runners to ascend to the 440-metre peak from various directions and passes through famous scenic spots in Pat Sin Leng Country Park, such as Lau Shui Heung, Hok Tau, and Sha Lo Tung.

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X 通常象徵著未知、無限、隱晦等意思，總帶有一種吸引人的神秘氣息。TRAIL X 賽事以新界北部九龍坑山為核心，TRAIL X 賽道設計以多方向登上海拔達440米的九龍坑山，途徑八仙嶺郊野公園著名景點如流水響、鶴藪及沙螺洞。