Emeraude Swimrun M covers 18.6 km in Saint-Lunaire, located on the Emerald Coast in Ille-et-Vilaine, Brittany. This event is contested by two-person teams, requiring partners to remain together throughout the course's alternating running and swimming segments, differentiating it from solo trail races or typical triathlons.
The course consists of 15 km of trail running and 3.6 km of swimming. This proportion defines it as a coastal swimrun, featuring significant swimming distances while emphasizing a team's trail running ability and transition management.