Sri Chinmoy Marathon Team International
Sports, Running, Trail Running, Ultramarathon - Sri Chinmoy Marathon Team International. Sponsor of multi-day races, including the world's longest certified race of 3,100 miles, triathlons, and many ultra events in more than 30 nations.
http://www.srichinmoyraces.org/
Ultrarunning and Hiking Page
Sports, Running, Trail Running, Ultramarathon - Extreme Ultrarunning. Resources, links, and general information.
https://www.extremeultrarunning.com/
New York Ultra Running
Sports, Running, Trail Running, Ultramarathon - New York Ultra Running. Contains details about races in the area, highlights, pictures, directions, and membership details.
http://www.newyorkultrarunning.org/
NTTR - North Texas Trail Runners
Sports, Running, Trail Running, Ultramarathon - North Texas Trail Runners. Information on trail running and ultra running in North Texas.
https://www.nttr.org/
UltraRunning Magazine
Sports, Running, Trail Running, Ultramarathon - UltraRunning Magazine. Magazine for ultramarathoners, with calendars, race results and reports, techniques and tips.
http://www.ultrarunning.com/
Green Belt Relay
Sports, Running, Trail Running, Ultramarathon - Green Belt Relay. 210 mile multi-terraine, 20 leg, teams of 10, around London's Green Belt.
http://www.greenbeltrelay.org.uk
Kepler Challenge
Sports, Running, Trail Running, Ultramarathon - Kepler Challenge. A 60 KM event located in Te Anau, New Zealand.
https://keplerchallenge.co.nz/
Vermont 100 Mile Endurance Run
Sports, Running, Trail Running, Ultramarathon - Vermont 100 Endurance Run. Each year, over 200 runners attempt to finish this hilly race under the 30-hour cutoff point.
https://www.vermont100.com/
Wasatch Front 100 Mile Endurance Run
Sports, Running, Trail Running, Ultramarathon - Wasatch Front 100 Mile Endurance Run. Race is held the first weekend after Labor Day, stretching from Layton to Sundance.
http://www.wasatch100.com/