IRONMAN 70.3 Knokke-Heist

IRONMAN 70.3 Knokke-Heist is a half‑distance triathlon hosted in Knokke‑Heist, Belgium, and promoted on the event organiser’s official site. The course uniquely begins with a 1.9 km swim in the Damme Vaart at Sluis (Netherlands), follows a fast, flat 90 km bike loop that crosses into Dutch territory, and finishes with a three‑loop 21.1 km run along the Knokke‑Heist coastline. The event is presented as the only IRONMAN race in Belgium and is promoted for its seaside resort setting, scenic coastal running and easy travel access by Brussels Airport and the Belgian rail network. The race weekend is supported by an IRONMAN Village, athlete shuttles and spectator facilities.

The 2026 edition is shown on the official pages as taking place in early September, with the IRONMAN 70.3 field listed for 6 September 2026 and a 06:00 local start time on the event page. Registration for the 2026 edition is listed as sold out on the organiser site; a "Notify Me" option is offered for updates. Official course pages provide downloadable GPX and PDF maps for swim, bike and run, and list on‑course nutrition partners, aid stations and medical support. Competitors are advised to consult the Athlete Guide and the event pages for final schedules, shuttle bookings and athlete‑specific logistics prior to race week.