XL Run is a running race in La Rochelle, on France’s Atlantic coast, organized by the Bureau des Sports d’Excelia La Rochelle. It is held on a Saturday in March and is still a young event, with the listed race marking its fourth edition.
The published details put the start at Rond-Point Gaston Perrier in the 17000 area of La Rochelle. The source does not give a distance, route map, field size, or finish-line details, so the clearest picture is of a student-sports-run local race rather than a long-established mass event.