{{more citations needed|date=March 2014}} {{Infobox athletics race | image = | imagesize = | caption = | date = June | location = 3 Towns of Yubetsu, Saroma and Tokoro, Hokkaido Prefecture, Japan | type = Road running | distance = 100 km/50 km | est = 1987 | record = | homepage = {{Official website}} }}

The '''Lake Saroma Ultramarathon''' is an annual 100&nbsp;km and 50&nbsp;km Ultramarathon foot road race held in June in the northeastern shore of Hokkaido, Japan since 1987. It is an IAU-labeled official 100&nbsp;km and 50&nbsp;km race, and an official JAAF race, and an AIMS (Association of International Marathons)-certified course. Its 1994 event was Asia's first IAU (International Association of Ultrarunners) 100&nbsp;km World Championship, and its 20th event in 2005 was also held as the IAU 100&nbsp;km Road World Championship.<ref>{{cite web |url=http://www.iau-ultramarathon.org/index.asp?menucode=h06-03&tmp=tmp3&taal=nl&submenux=Statistics&foto=photo7 |title=IAU Ultra Marathon |website=www.iau-ultramarathon.org |url-status=dead |archive-url=https://web.archive.org/web/20120306002226/http://www.iau-ultramarathon.org/index.asp?menucode=h06-03&tmp=tmp3&taal=nl&submenux=Statistics&foto=photo7 |archive-date=2012-03-06}}</ref><ref name="auto">{{Cite web | title=第40回サロマ湖100kmウルトラマラソン【公式】 | url=http://saromanblue.jp/ | access-date=2025-09-01 | website=saromanblue.jp}}</ref>

==Course== thumb|Location of Lake Saroma in Japan The 100&nbsp;km race starts at the Sports Center in the town of Yubetsu in the west of Lake Saroma, takes a course around the Lake Saroma with two main peaks of around 40 meters<ref>{{cite web |url=http://saromanblue.jp/guidance/course.html |title=コース {{pipe}} 第28回サロマ湖100kmウルトラマラソン兼IAU 100km世界選手権2013 日本代表選考会 |accessdate=2014-02-25 |url-status=dead |archiveurl=https://web.archive.org/web/20131028140058/http://saromanblue.jp/guidance/course.html |archivedate=2013-10-28 }}</ref> and finishes at the Sports Center in the Town of Tokoro. Men's 100 km course record is 6:09:14 achieved in 2018 by Nao Kazami, and women's course record is 6:33:11 achieved in 2000 by Tomoe Abe. Both records are current IAU and World Athletics 100 km road world records.<ref name="competition rules">{{cite book |author1=World Athletics |title=Book C – C1.1 Competition Rules |date=2021 |url=https://worldathletics.org/download/download?filename=fd5b5041-3d25-4f9b-b951-c5e642d6cfe7.pdf&urlslug=C1.1%20-%20Competition%20Rules |access-date=29 August 2022 |archive-url=https://web.archive.org/web/20220829092453/https://worldathletics.org/download/download?filename=fd5b5041-3d25-4f9b-b951-c5e642d6cfe7.pdf&urlslug=C1.1%20-%20Competition%20Rules |archive-date=29 August 2022 |url-status=live |format=PDF}}</ref><ref>{{cite web| url = http://www.iaaf.org/records/toplists/road-running/100-kilometres/outdoor/men/senior| title = 100 Kilometres - men - senior - outdoor}}</ref><ref name="auto1">{{cite web| url = http://www.iaaf.org/records/toplists/road-running/100-kilometres/outdoor/women/senior| title = 100 Kilometres - women - senior - outdoor}}</ref><ref name="auto"/> Time limit to finish the 100&nbsp;km race is 13 hours. Notable athletes who had run the race include Erick Wainaina in 2010 and 2013.

The 50&nbsp;km race starts at the Town of Saroma, finishing at the same place as the 100&nbsp;km race in the town of Tokoro. Time limit to finish the 50&nbsp;km race is 8 hours.

The course' scenic beauty was described as "one of the most beautiful Ultra courses" by Malcolm Campbell, the founder and then president of IAU<ref>{{Cite web| url=http://iau-ultramarathon.org/nieuwsarchief.asp?menucode=h02&col001=478&more=x&taal=nl&foto=photo1 | title=IAU News - Charlotte Vasarhelyi | date=November 2010 | access-date=2014-02-25 | archive-date=2014-08-09 | archive-url=https://web.archive.org/web/20140809222045/http://iau-ultramarathon.org/nieuwsarchief.asp?menucode=h02&col001=478&more=x&taal=nl&foto=photo1 | url-status=dead}}</ref> who visited Saroma in 1994 to announce the start of the race.<ref name="auto"/>

==100 km Results and Data== Course Records (also current 100&nbsp;km Road world record) *Men 6:09:14, 2018, Nao Kazami, Japan<ref>{{cite news|title=Kazami Breaks 100 km World Record at Lake Saroma|url=http://japanrunningnews.blogspot.com/2018/06/kazami-breaks-100-km-world-record-at.html|website=japanrunningnews.blogspot.com|author=Brett Larner|date=24 June 2018|access-date=28 August 2022|archive-url=https://web.archive.org/web/20180817203523/http://japanrunningnews.blogspot.com/2018/06/kazami-breaks-100-km-world-record-at.html|archive-date=17 August 2018|url-status=live}}</ref> *Ladies 6:33:11, 2000, Tomoe Abe, Japan<ref name="auto1"/>

'''2013'''<ref>{{Cite web|url=http://japanrunningnews.blogspot.com/2013/06/world-leads-at-lake-saroma-ultra-as.html|title=World Leads at Lake Saroma Ultra As Federation Cancels Team Selection for World Championships|website=japanrunningnews.blogspot.com}}</ref>

Temperature during the race: 11.0-23.7 degree Celsius<ref name="auto2">{{cite web |url=http://saromanblue.jp/guidance/data.html |title=大会記録と過去大会データ {{pipe}} 第28回サロマ湖100kmウルトラマラソン兼IAU 100km世界選手権2013 日本代表選考会 |accessdate=2014-02-25 |url-status=dead |archiveurl=https://web.archive.org/web/20130813211900/http://saromanblue.jp/guidance/data.html |archivedate=2013-08-13 }}</ref><br /> Finishing rate : 68.9% *Men # Nojo Hideo, Japan 6:37:16 # Takayoshi Shigemi, Japan 6:41:44 # Tsutomu Nagata, Japan 6:44:33 # Yoshiki Takada, Japan 6:49:53 # Erick Wainaina, Kenya 6:55:09 *Ladies # Mai Fujisawa, Japan 8:10:39 # Tomoko Hara, Japan 8:23:33 # Hisayo Matsumoto, Japan 8:30:37 # Wakako Oyagi, Japan 8:31:13 # Mikiko Ota, Japan 8:33:10

'''2012'''

Temperature during the race : 9.5-14.1 degree Celsius<ref name="auto2"/><br /> Finishing rate : 75.6% *Men 1 Yoshikazu Hara, Japan 6:33:32 *Ladies 1 Shiho Katayama, Japan 7:33:38

'''2011'''

Temperature during the race : 8.7-25.6 degree Celsius<ref name="auto2"/><br /> Finishing rate : 68.2% *Men 1 Kiyokatsu Hasegawa, Japan 6:31:06 *Ladies 1 Naomi Ochiai, Japan 7:54:08

'''2010'''

Temperature during the race : 19.5-28.0 degree Celsius<ref name="auto2"/><br /> Finishing rate : 49.9% *Men 1 Erick Wainaina, Kenya 6:39:52 *Ladies 1 Emi Matsushita, Japan 7:49:31

'''2009'''

Temperature during the race : 13.0-16.0 degree Celsius<ref name="auto2"/><br /> Finishing rate : 73.4% *Men 1 Hideo Nojo, Japan 6:36:33 *Ladies 1 Emi Iwasaki, Japan 8:09:36

'''2008'''

Temperature during the race : 9.0-16.0 degree Celsius<ref name="auto2"/><br /> Finishing rate : 73.0% *Men 1 Masakazu Takahashi, Japan 6:42:05 *Ladies 1 Hiroko Sho (or, Syou), Japan 7:38:04

'''2007'''

Temperature during the race : 11.0-17.5 degree Celsius<ref name="auto2"/><br /> Finishing rate : 72.1% *Men 1 {{Interlanguage link multi|Shin-ichi Watanabe|de|3=Shin'ichi Watanabe (Leichtathlet)}} , Japan 6:29:57 *Ladies 1 Norimi Sakurai, Japan 7:16:23

'''2006'''

Temperature during the race : 12.0-23.5 degree Celsius<ref name="auto2"/><br /> Finishing rate : 67.8% *Men 1 Yoshiaki Kobayashi, 6:49:15 *Ladies 1 Hiroko Sho (or, Syou), Japan 7:40:30

'''2005'''

Temperature during the race : 15.0-25.0 degree Celsius<ref name="auto2"/><br /> Finishing rate : 68.3% *Men 1 Gregory Murzin, Russia 6:24:15 *Ladies 1 Hiroko Sho (or, Syou), Japan 7:53:41

'''2004'''

Temperature during the race : 15.0-26.0 degree Celsius<ref name="auto2"/><br /> Finishing rate : 62.5% *Men 1 Tsutomu Sassa, Japan 6:23:00 *Ladies 1 Makiko Hotta, Japan 7:38:31

'''2003'''

Temperature during the race : 10.0-13.0 degree Celsius<ref name="auto2"/><br /> Finishing rate : 73.5% *Men 1 Yoshiaki Kobayashi, Japan 6:38:06 *Ladies 1 Norimi Sakurai, Japan 7:20:02

'''2002'''

Temperature during the race : 17.0-29.0 degree Celsius<ref name="auto2"/><br /> Finishing rate : 60.8% *Men 1 Yasufumi Mikami, Japan 6:48:07 *Ladies 1 Makiko Hotta, Japan 7:30:23

'''2001'''

Temperature during the race : 17.5-29.8 degree Celsius<ref name="auto2"/><br /> Finishing rate : 47.0% *Men 1 Yasufumi Mikami, Japan 6:38:50 *Ladies 1 Norimi Sakurai, Japan 8:00:41

'''2000'''

Temperature during the race : 10.0-29.0 degree Celsius<ref name="auto2"/><br /> Finishing rate : 57.5% *Men 1 Yasufumi Mikami, Japan 6:27:13 *Ladies 1 Tomoe Abe, Japan 6:33:11 (Current World Record of Ladies' 100 km marathon)

'''1999'''

Temperature during the race : 9.3-14.5 degree Celsius *Men 1 Yasufumi Mikami, Japan 6:22:08 *Ladies 1 Akiko Sekiya, Japan 8:03:44

'''1998'''

Temperature during the race : 9.0-11.0 degree Celsius *Men 1 Takahiro Sunada, Japan 6:13:33 *Ladies 1 Masako Koyama, Japan 8:21:26

'''1997''' *Men 1 Yasufumi Mikami, Japan 6:24:56 *Ladies 1 Reiko Hirosawa, Japan 8:19:48

'''1996''' *Men 1 Patrick Macke, Great Britain 6:56:13 *Ladies 1 Noriko Kawaguchi, Japan 7:11:42 '''1995''' *Men 1 Kiminari Kondo, Japan 6:26:23 *Ladies 1 Mary Morgan, Australia 7:49:40 '''1994''' *Men 1 Alexei Wolgin, Russia 6:22:43 *Ladies 1 Walentina Schatjajewa, Russia 7:34:58

'''1993''' *Men 1 Narihisa Kojima, Japan 6:43:14 *Ladies 1 Eiko Endo, Japan 8:22:25

'''1992''' *Men 1 Narihisa Kojima, Japan 6:36:34 *Ladies 1 Eiko Endo, Japan 8:17:01

'''1991''' *Men 1 Narihisa Kojima, Japan 6:37:44 *Ladies 1 Eiko Endo, Japan 8:28:23

'''1990''' *Men 1 Toshiro Kashihara, Japan 6:52:33 *Ladies 1 Takako Suzuki, Japan 8:47:09

'''1989''' *Men 1 Toshiro Kashihara, Japan 6:52:41 *Ladies 1 Takako Suzuki, Japan 8:37:13

'''1988''' *Men 1 Toshiro Kashihara, Japan 7:06:35 *Ladies 1 Takako Suzuki, Japan 8:40:07

'''1987''' *Men 1 Koji Inoue, Japan 6:52:14 *Ladies 1 Takako Suzuki, Japan 9:24:10

'''1986''' (pre event) *Men 1 Masatoshi Tandai, Japan 7:49:17 *Ladies 1 Harumi Kajita, Japan 11:07:38

==References== {{Reflist}}

==External links== *[http://saromanblue.jp/ Lake Saroma Ultramarathon Official Website (Japanese)] *[https://www.facebook.com/saroma100km|Lake Saroma Ultramarathon Official Facebook] *[https://www.youtube.com/watch?v=ckNSZ9i3SjU|A participant's youtube video of 2013 Lake Saroma 100 km Ultramarathon]

Category:Recurring sporting events established in 1987 Category:Ultramarathons in Japan Category:Marathons in Japan