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PERSENC ULTRA MARATHON is a mountain trail ultramarathon centered on the Persenk ridge near Asenovgrad in Bulgaria’s Plovdiv region. The event offers multiple distance options—roughly 30 km, 50 km, 115 km and 161 km—over technical single-track trails and significant elevation through Rhodope forest and ridge terrain. It is notable for its challenging mountain routes and scenic, varied terrain that attract endurance trail runners seeking long-distance navigation and c