Route through the peri-urban forest of Serres and the Elaionas mountain area. Terrain: 85% trails, 5% asphalt, 10% dirt road. Time limit: 4 hours. Aid stations at km 5, km 12, and km 18. Athlete checkpoint at km 12. Trail shoes and comfortable clothing recommended. Mandatory equipment: water vessel and fully charged mobile phone. Dropout point at km 13.8 in Elaionas village with rescue team on-site. Age requirement: 18+. Awards for top 3 men and women overall and per age group (18–29, 30–39, 40–49, 50–59, 60+). BIB pickup: Saturday 30 January at Kronios Square, 10:00–14:00 (on-site registration also available). Race day pickup: Serres Valley, 08:00–10:30. Contact: support@kalikantzaros-trail.gr, tel. 6973207343.