U
- Udabno Raid
- Udin Boršt rdeča pot / red course
- Uinta Highline Trail
- Úlfarsfell from Skarhólamýri
- Ulrichshorn North Face - 3925m
- Ulrichshorn North Face - 3925m
- Ultra Huachi 60k 2023
- Ultraks Z101
- ultramediterrania Pro 162km
- Ultra Tour Monte Rosa 170km
- Uludağ Göller ve Zirve yeAlternatif Çıkış Rotası
- UMAM 2024 105K
- UMAM 55K 2024 (Calcahualco / Parque Nacional Pico de Orizaba)
- UMAMCITO 21K 2023
- Under Mae-Hotaka
- Under-the-Rim Trail + Yovimpa Pass Loop
- Undir trjánum
- Une p'tite itinérance à VTT du côté d'Aubazine
- Un giorno e mezzo sui Lucretili da Prato Favale
- Union
- Unknown Couloir
- UNKNOWN GLACIAL LAKE, CS3 TO PANJTARI
- Unterau - Froschhauser See
- Untere + Obere Firstalm
- Unterer
- Up and down above the Aegerisee
- Up Gaustatoppen from skiers parking / down under the tower
- UP Gravel Grinding
- Upper and Lower Garfield Mountain Lakes
- Upper Cornice Bowl
- Upper Creek Trail
- Upper Drops
- Upper Egress
- Upper Glove Bowl
- Upper Grizzly Bowl
- Upper Havey’s Dream
- Upper Hell's Delight
- Upper Imperial Bowl
- Upper Kirkwood Connector Trail
- Upper Kitchen Wall (Right Side)
- Upper Knife Ridge Chutes #1-21
- Upper Nosedive Glades
- Upper NW
- Upper Pinnacles at Big Sky Resort
- Upper Tunnel Vision to Hindsight to Lower Tunnel Vision
- Upper Tyee
- Upper Whale's Tail
- Upper Wildcat Lake and Gem Lake
- Upper Women's Downhill
- Upper Zone 0
- Up to the Jägerbauernalm
- Urðarhólar - Víknaslóðir
- Urkedalstind S couloir
- Urkeegga
- Ursa Major
- Ursa Minor
- Urschner Höhenweg
- Ursus Minor SE couloir- VCR Bowl Link up
- Ursus Trees
- Ussita-Garulla
- UTDS 80Km - 2023
- UTMB Mozart 100 (2024)
- UTMR 2021 100 km Ultra 3 Passes
- UTMR Höhenweg 58 km
- Utrobata - Raiski Izgled
- UTS165
- U-Turn