Held at the Serres International Circuit, the largest and most modern motorsport circuit in the Balkans: a flat, completely level lap of 3047m on special soft asphalt with 7 left turns and 9 right turns, certified by an official World Athletics & AIMS measurer. Teams of 3, each member running a 2-hour leg (6 hours total); teams may be mixed gender. One team member handles registration for the whole team and enters teammates' details on their behalf. Minimum age 18. Electronic chip timing, chip issued with bib at pickup. Registration opens August 1, 2025, online only. Bib/kit pickup: Thu Mar 19 & Fri Mar 20, 17:00-21:00, at Plateia Kroniou (in front of the Serres Chamber of Commerce); Sat Mar 21, 07:00-08:00, at the circuit secretariat. Technical briefing/welcome ceremony: Friday March 20, 18:30, Serres Chamber of Commerce, "Georgios Christidis" hall. A camping area is available on the circuit grounds over the event weekend for anyone wanting to stay overnight, with hot water showers and toilets. Awards ceremony Saturday March 21, 17:00: cups for the top 3 teams (no separate men's/women's team categories), plus a cup for the individual athlete, man or woman, with the fastest per-leg pace. Entry fee includes bib, timing chip, medal, aid-station food/drink and event T-shirt. Strict no-littering rule (waste only in designated bags at aid stations; penalty is disqualification); athletes must obey race judges. Protests must be filed in person by the athlete within 30 minutes of their own finish, decided by the race jury before the awards ceremony; the decision is final and binding. Organizers may briefly delay the start in case of dangerous weather. Participants race entirely at their own risk and self-certify fitness via a liability waiver signed at bib pickup. Cancel by Feb 15, 2026 for a 50% refund within 10 business days; no refund or transfer after that date; switching to a cheaper race does not entitle you to a refund of the difference; transfer to next year's edition allowed only if requested by Feb 15, 2026. Official results published a few days after the event pending verification. Info: support@serrescircuitrun.gr, +30 6973440049.