100-mile ultra races with entry-route guides.

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Mountain 100-mile lottery requiring qualifying races and service requirements.

A 253-mile continuous trail ultra from Black Canyon City to Flagstaff across Arizona. Places are drawn by lottery, with a separate charity bib route for runners who miss out.

A looped 100-mile desert trail race in Arizona, known for its Halloween party atmosphere. It is both a Western States qualifier and a Golden Ticket race, so a strong finish can buy entry to a far harder lottery.

A 135-mile road ultramarathon from Death Valley to Whitney Portal in July heat, entered by application against qualifying criteria rather than sold.

A brutally technical five-loop 100-miler in the Honolulu rainforest, with one of the lowest finish rates in the sport. Places go to a lottery.

A high-altitude 100-miler along the Wasatch Range, one of the original US hundred-milers. Places go to a lottery.

A high-country Colorado 100-miler with an unusually large prize purse, run above Steamboat Springs.

A 330km single-stage loop of the Aosta Valley with no mandatory stops, taking most finishers the better part of a week. Places go to a lottery.

The Diagonale des Fous crosses Réunion from south to north over volcanic terrain, with more than 10,000m of ascent. Places go to a lottery.

A 160km loop of the Aran Valley in the Spanish Pyrenees, part of the UTMB World Series.

A 268-mile non-stop winter race along the Pennine Way in January, with a seven-day limit and no route markings.

A point-to-point 100-miler along the Angeles Crest from Wrightwood to Pasadena, one of the original US hundred-milers. Places go to a lottery.

A 240-mile continuous loop through the Utah canyonlands past Arches and Canyonlands, taking most finishers several days.

A winter 100-miler along Cornwall's South West Coast Path, run largely in darkness and weather. It joined the UTMB World Series in 2025.

A 100-mile circuit of Mount Fuji through the surrounding forests and lakes. Formerly Ultra-Trail Mt. Fuji, renamed Mt. Fuji 100 — the old domain no longer resolves.

One of the original US 100-milers, run on Vermont dirt roads and trails alongside a concurrent 100-mile horse race.

One of the world's longest-established ultramarathons, 95 miles along the West Highland Way from Milngavie to Fort William, first run in 1985.

A 105-mile circuit of the Lake District fells, self-navigated and widely regarded as one of the toughest hundred-milers in the UK.

A 240km run from the Pacific at Eden to the summit of Mount Kosciuszko, Australia's highest point. Entry is by application and strictly limited.

A multi-distance mountain ultra in the Argentine Lake District, and one of South America's largest trail events.