100 km road races

North American Races

Canada
• Prairie Inn Harriers Elk/Beaver Ultras - Victoria, B.C (5/3/2008)
• ACU National Championships - Toronto, Ontario (5/3/2008)
• Triathlon Levis - Levis, Quebec (7/5/2008 I think) - yes, it is a 100km race.

USA
• Iron Horse 100k - Orange Park, FL - 3/1/2008
• WSU 100k relay and solo - Washington State University, Pulman, WA (4/20/2008)
• Ruth Anderson 100km - San Francisco, California (4/19/2008)
• Lake Waramaug - New Preston, Connecticut (4/20/2008)
• Pony Express - Cameron Park, California (5/17/2008)
• Green Lakes 100k - Fayetteville, New Your (8/24/2008)

South American Races

Argentina
• San Miguel del Monte - Buenos Aires, Argentina (September???)

Asian and Australian Races

Japan
• 2002 Ultramarathon Calendar Dated, Also mentions races at other distances.

Australia
• Gold Coast 100 - Gold Coast, Queensland (6/11/2006)

European Races

Belgium
• Night of Flanders

Netherlands
• Stichting Ultraloop Winschoten - Winschoten, NL (9/16/2006)

Italy
• del Passatore - recommended by Don Winkley
• San Giovanni Lupatoto - 100km on a track!

Spain
• Santander

Calendars

International
• ACU International Calendar
• Ultramarathon for you
• Run The Planet
• ultrafondus
• Longest Running Ultramarathons 22

Canadian
• ACU Canadian Championship Calendar

Italian
• calendari

United States
• Southern California Ultra Series

Organizations

• International Association of Ultrarunners
• USA Track and Field
• USATF - Southern California Association
• USATF - Pacific Association
• American Ultrarunning Association
• Association of Canadian Ultramarathoners (ACU)
• Italian Ultrarunning and Trail Association
• Association of Road Running Statisticians

Records, Standards, and Other Lists

• All-Time 100 km Road

Other Websites

• Stan Jensens Run 100s website - If you had to pick one website for ultra running information, this would be it.