Challenge Almere-Amsterdam takes place on 11 September 2027 in Almere, The Netherlands. The organizer is Challenge Family. The long distance is 3.8 km swim, 180 km bike and 42.2 km run, with a pro race and a Tri Together option. The swim is in a lake, and the race describes its course as the only one in the world below sea level. On the long distance, the bike course has 232 m of elevation and the run has 88 m.
The programme also includes a middle distance (1.9 km swim, 94 km bike, 21.1 km run), an aqua bike, a Junior Challenge, a super sprint distance, a kids run and a 42.2 km run. A Marathon, newly announced, runs concurrently with the final stages of the long distance triathlon. There are seven side events in total.
Almere has hosted eleven European Championships, the most recent in 2025, and two World Championships, in 2008 and 2021. The race records are 7:36:36 (Menno Koolhaas) and 08:22:30 (Marlene de Boer). The entry includes a medal, T-shirt, swim cap and backpack.
