Sado Island (佐渡島 or 佐渡ヶ島, both Sadogashima) in Niigata Prefecture, in the Chūbu region of Japan. Sado is the sixth largest island of Japan in area following the four main islands and Okinawa Island. With its dramatic mountains, lush forests and temperate climate, Sado Island is now a popular retreat, located west of Niigata Prefecture in the Sea of Japan. The Sado Channel Crossing is a 40 km prison island swim and one of the World's Top 100 Island Swims.
In medieval times, the island was a place of banishment for those who had fallen out of favor with the rulers of the day. More than 70 people—notably aristocrats and artists—were exiled here, beginning in A.D. 722 with the poet Asomioyu Hozumi, who criticized the emperor. Other exiles included the Emperor Juntoku, who attempted a coup against the Kamakura shogunate in 1220, and the monk Nichiren in 1271, who preached a radical form of Buddhism. Today, many attribute the island’s eclectic population and cultural riches—Sado has more than 30 Noh stages and is known as the “Island of Performing Arts”—to the presence of these early exiles.
Kizuna Enei Oudan Project
A 17-member Ocean Navi relay team took 16 hours 18 minutes to swim across the 43 km Sado Channel course. The 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.
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 30 May 2018 in 11 hours 31 minutes 21 seconds, Hiroko Ashikawa, Chie Hitomi, Yuichi Nakagawa, Takayuki Tsutsui, Takeshi Yoshida, Soda Ken, Keiko Sasaki, Hiroyuki Matsuura and Youri Lavoine with team leader Masayuki Moriya completed a swim from Sado Island to the western shores of Honshu on the Japanese mainland.
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.
- On 21 October 2020, the 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.
- Swimming Straight Across Sado
- Team Ocean Navi Times Ten Across The Sado Channel
- Marathoning With Masayuki Moriya
- Swimming Sado
- World Open Water Swimming Association
- Daily News of Open Water Swimming
- Open Water Swimming
- Marathon Swimming
- Relay In Its Prime, 17 Doing 43
- Ocean Navi Team Completed Sado Channel Relay
- 10 Infamous Islands Of Exile
- Swimming From Sado
- Swell Swimming Across Sado
- Swimming From Sado To Shore
- Swimming Straight From Sado