第5回 南紀白浜オープンウォータースイムレース

The 5th Nanki Shirahama Open Water Swim Race is listed as part of JIOWSA's Open Water Swim Series. The series is described as a swimming competition held in natural settings such as the sea or lakes, and this event is associated with Shirarahama Beach in Shirahama, Wakayama Prefecture. The source positions the race within a nationwide open-water swim calendar and indicates that English-language inquiries about race registration can be made through the contact form. Based on the supplied source text, the event is an open-water swimming race using a natural water venue rather than a pool setting.