Trail running is a challenging outdoor sport, attracts numerous runners seeking to push their limits, traverse wilderness, and conquer rugged terrains. Globally, there are many renowned trail running events, and five particularly stand out as dream stages for extreme runners. Let's journey across continents, challenge mental limits, and explore these fascinating trail running events.

1. Hardrock 100-Mile Endurance Run (USA)

Taking place in Colorado, the Hardrock 100-Mile Endurance Run stands as one of the highest-altitude 100-mile races globally. Runners navigate through cliff edges, glacial lakes, and high-altitude regions, climbing over 30,000 feet of elevation gain. This event tests participants' endurance, technical skills, and adaptability to high-altitude conditions.

2. Western States 100-Mile Endurance Run (USA)

The Western States 100-Mile Endurance Run is hailed as the pioneer of global 100-mile events and is among the oldest and most challenging ones. This event spans the mountains, deserts, and forests of California, covering a total distance of 100 miles (approximately 160 kilometers). Participants must endure high temperatures, low temperatures, altitude changes, and complex terrains, pushing their physical and mental endurance to the limit.

3. Four Sisters Mountain Trail Run (China)

The Four Sisters Mountain Trail Run, set against the backdrop of the breathtaking landscapes of China's Four Sisters Mountains, is a race that captures the imagination. The challenge lies not only in the technically demanding mountain paths but also in extreme altitude variations, allowing participants to experience the mystical beauty of the mountains shrouded in clouds and mist.

4. Dragon's Back Race (UK)

The Dragon's Back Race, one of the most challenging trail running events in the UK, traverses the beautiful mountains of England. Participants must navigate through cliffs, marshlands, and lakes, covering over 70 miles (about 112 kilometers). This event not only challenges the physical stamina of runners but also demands resilience in the face of the unpredictable weather conditions of the UK.

5. Pyrenees Stage Run (Pyrenees 900km Challenge)

The Pyrenees Stage Run spans France, Spain, and Andorra, ranking among Europe's most challenging trail running events. Participants traverse high mountains, canyons, and snow-covered landscapes, conquering nearly 20,000 meters of elevation gain over 900 kilometers. This event is a dreamland for extreme runners, challenging their understanding of nature and geography.

These five events not only represent the pinnacle of trail running challenges but also serve as stages where runners chase their limits and challenge themselves. Each event boasts unique geographical environments and extreme weather conditions, requiring runners to surpass their physical limits and overcome inner fears. It is this desire to challenge oneself that makes trail running an exhilarating and adventurous sport. Whether crossing the wild landscapes of the USA, conquering the majestic mountains of China, or traversing the peaks of Europe, these five events offer extreme runners excellent opportunities to ascend the peaks of natural achievement.