| AC100 RaceBook: The official record and program of the Angeles Crest 100 Mile Endurance Run. Includes course and driving maps for runner and crew. 1986-2001 information. |
| American Ultrarunning Association: Membership details, race listing, USA National Ultra Team, description of the organization and related links. |
| Australian Ultra Runners' Association: Seeks to promote ultramarathon running in Australia. Provides a race calendar, results, news, and links. |
| Cascade Running Club: Hosts 100 mile, 50 Mile and 50K minimalist runs in Washington. Includes club information and race details. |
| Endurance Sport Club: International organization, based in Canada, that sponsors a number of fat-ass style ultra-races. Includes membership information and race calendar. |
| Extreme Ultrarunning: Resources, links, and general information. Includes runners' profiles, calendar, photographs and race reports. |
| Hal Higdon: On The Run - Ultramarathon Training: While focusing on the Comrades Marathon, author Higdon provides a training plan useful for a wide range of ultras. |
| International Association of Ultra Runners: Provides organizational information, newsletters, race listing and coming events, training tips, and links. English and Chinese versions. |
| Kansas Ultrarunners' Society: Includes event descriptions, member biographies, pictures, newsletters and membership information. |
| Kevin Sayers UltRunR Site: Resources and opinions on topics ranging from training and racing tips to equipment recommendations. |
| Marathon and Beyond: Published six times a year - website contains tables of content, sneak previews and ordering information. |
| Marathon of Britain: News, the team, photographs, faq's, and community. |
| Multidays.com: Resource for multi-day events with calendars, news, results, and training information. |
| New York Ultra Running: Contains details about races in the area, highlights, pictures, directions, and membership details. |
| North Texas Trail Runners: Information on trail running and ultra running in North Texas. Features calendar listings and a news/opinion section. |
| Running the Hardrock 100: First-hand account of running the Hardrock 100 through Colorado's San Juan Mountains by Bob Boeder. |
| 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. Includes news, photos, race information, library and links. |
| Sri Chinmoy Marathon Team New York: Multi-day events, including an annual 3,100-mile race. Information on upcoming races and events, articles, and contact information. |
| St. Louis Ultrarunners Group: Provides club news and events, including registration materials. |
| Stan Jensen's Ultramarathon Guide: Provides general information on the sport, especially focusing on northern California. Includes information and statistics for the top races in the USA, as well as personal achievements, and goals. |
| Team CRUD (Coloradans Running Ultra Distances): Ultra trail running information, photographs, news, and links. |
| The 100km Association: Club serving Britain. Includes news and events, club information, message board, and race results and reports. |
| Ultra Adventures: Comprehensive regional ultrarunning resource focusing on North Carolina and the Mid-Atlantic region. |
| Ultrafit Endurance Sports: Company that specializes in products designed for the endurance athlete. |
| UltraOz: Includes news, links, and race descriptions. |
| UltraRunner.net: Resource for clubs and races in North America with upcoming events, pictures, related links, mailing list and course descriptions. |
| Ultrarunners Organization: Includes descriptions and links to events, photos and contact information. |
| Will Brown's Umstead 100 Report - 2001: Will Brown conquers the 100 mile distance at the 2001 Umstead 100 Mile Run in Umstead State Park, Raleigh, North Carolina, April 7-8, 2001. |
Classical
