Trail running

The UTMB — a 171 km lap of the Mont Blanc massif with 10,000 m of climbing, the sport's biggest stage.

The MIUT route: coast to coast across Madeira's volcanic spine on levadas and peaks.

The Lofoten Ultra-Trail, part of the Arctic Triple, run over the islands' knife-edge ridgelines.

Long ridge running with almost nobody else on the trail.

Flat, easy forest running for recovery days between harder trips.

The Transgrancanaria terrain — pine peaks, barrancos and southern dunes.

The Transvulcania terrain — sea level to 2,426 m over the volcanic spine.

The Ultra Pirineu terrain, a hundred kilometres over the Cadí and Moixeró crests.

The border crest of the Karkonosze from Szrenica to Śnieżka, with glacial cirques along the way.

The route of the oldest 100-mile trail race, from Olympic Valley over the Sierra to Auburn.

The Laugavegur Ultra Marathon — 55 km down Iceland's most famous trekking route in a day.