José Manuel Romero from Badalona, Spain / CC BY 2.0 / Wikimedia Commons

100 km BDN Challenge — 100K solidarity ultra

A 12-hour solidarity challenge on a flat seafront loop where participants run, walk or relay towards 100 km, with all profits going to AFANOC (children with cancer). Ran its 10th anniversary on 11 October 2025; listed again for 11 October 2026.

See how this race fits your training, the course profile and who else is going.

Registration on the organiser's site: cronocheck.com/public/index.php/100km-challenge-bdn