Kumiko Koizumi is a Japanese open water swimmer.
Open Water Swimming Highlights
- She was a member of the Ocean Navi relay team that took 16 hours 18 minutes to swim across the 43 km Sado Channel course.
- The Ocean Navi team included Masayuki Moriya, Motoko Honma, Hidehiko Kato, Kaori Fukusima, Noriko Kawasaki, Ayako Kawasaki, Yoshimitsu Kitazawa, Noriko Kimura, Jun Kuwabara, Kumiko Koizumi, Maki Sakamoto, Akira Shima, Etsuko Shima, Akiko Niide, Isami Mitsuhashi, Kyoko Morikawa, and Eriko Yoshino.
- On 13 June 2018, Kumiko Koizumi, Masamichi Taniuchi, Tamotsu Yoshida, Noriko Kawasaki, Minori Tanaka, Takaomi Modegi, Yukie Makino, Terumi Nakayama and Satoko Murata completed a 43 km crossing of Sado Channel from Sado Island to Niigata Prefecture on the Japanese mainland in 13 hours 7 minutes 4 seconds.
- Team Ocean Navi including wetsuited swimmers Taku Wakabayashi, Eri Obiya, Saki Watanabe, Hiroto Kagami, Takeomi Modagi, Masamichi Taniuchi, Kumiko Koizumi, Aya Kurano, Yasuko Takeda, Mayumi Doi, Tanomi Muraki and Nishina Yuichi completed a 12 hour 24 minute 40 km crossing of the Sado Channel from Sado Island to the Honshu mainland on 12 June 2019 observed by Masayuki Moriya with the support of Honma Motoko.
- Team Ocean Navi including Hiroko Kasahara, Noriko Kimura, Kumiko Koizumi, Maki Sakamoto, Daisuke Tanaka, Mayumi Doi, Rei Yamazaki, Motoko Honma, and Masayuki Moriya completed a 13 hour 40 minute 40 km crossing of the Sado Channel on 7 June 2016.
- On 5 September 2020, she swam with Tomonari Ogino, Chika Nishibori, Miho Yonezawa, Syuji Nao, Minori Tanaka, Toshihiko Manabe, Yasuko Takeda, Satoko Murata, and Ayaka Matsushita with observer Masayuki Moriya and support crew Honma Motoko on a 21 km Ocean Navi relay from Enoshima to Jogashima in eastern Japan in 7 hours 11 minutes 18 seconds.
- On 21 October 2020, Team Ocean Navi relay members Chika Nishibori, Kumiko Koizumi, Minori Tanaka, Syuji Nao, Hiroko Ashikawa, Rie Tamai, Yuki Tsunoda, Tomoko Tamura, Syusei Uzawa and Kenji Kambe with observer Masayuki Moriya and crew member Honma Motoko crossed the 42 km Sado Channel in 15 hours 16 minutes 17 seconds.
- Koizumi was a member of チーム野獣 or Team Yajyu (meaning Team Beast in English), a 6-person Japanese open water swimming team that crossed the Tsugaru Channel from Honshu to Hokkaido on 26 July 2016 under the auspices of Ocean Navi and the escort of pilot Captain Mizushima of Tappi Misaki in Aomori Prefecture. Its members included 1st Tomonari Ogino (荻野 智成), 2nd Miho Yonezawa (米沢 美穂), 3rd Akiko Niide 新出 亜希子), 4th Takeshi Yamamoto (山本 毅), 5th Yumiko Okuda (奥田 由美子), and 6th Kumiko Koizumi (小泉 久美子).
- Koizumi was a member of Team Tonatsu or チーム都夏, a 3-person relay that swam across the Tsugaru Channel from Honshu to Hokkaido in northern Japan on 13 July 2020 in 10 hours 40 minutes 29 seconds. Its members included Takaomi Modegi, Koizumi, and Yukie Makino.
Tsugaru Channel Relay Crossing
2020 Tsugaru Channel Relay Crossing
Sado Island to Honshu
Ocean Navi team of Kumiko Koizumi, Masamichi Taniuchi, Tamotsu Yoshida, Noriko Kawasaki, Minori Tanaka, Takaomi Modegi, Yukie Makino, Terumi Nakayama and Satoko Murata completed a relay crossing of the Sado Channel from Sado Island to the Japanese mainland of Honshu in 13 hours 7 minutes 4 seconds on 13 June 2018.
- Swimming Straight Across Sado
- Team Ocean Navi Times Ten Across The Sado Channel
- 10 Swimmers From Enoshima To Jogashima In Eastern Japan
- Takaomi Modegi, Kumiko Koizumi, Yukie Makino Complete Tsugaru Crossing
- チーム野獣 Across Tsugaru
- Tsugaru Channel Swimming Association
- Ocean Navi website
- World Open Water Swimming Association
- Open Water Swimming
- Swimming From Sado
- Relay In Its Prime, 17 Doing 43
- Ocean Navi Team Completed Sado Channel Relay
- Marathon Swimming
- Daily News of Open Water Swimming
- I Got Stung
- World Marathon Swimming Association
- Sado Channel Crossing
- Swell Swimming Across Sado
- Swimming From Sado To Shore
- Swimming Straight From Sado