17th anniversary edition of the oldest 100-mile trail race in Greece and the third-oldest in Europe (called Rodopi Ultra Trail until 2012 and Rodopi Advendurun 100 Miles from 2013 to 2019). Registration opens on Sunday, February 21, 2027 at 20:00 via www.rout.gr and stays open while places remain; we'll update the page when it opens. A self-reliant 'advendure' (adventure + endurance) ultra in the tradition of the original US mountain 100-milers such as Western States, Hardrock and HURT, with the emphasis on real support at the aid stations and on its volunteers, and the only race that finishes uphill. Circular course through the remote Rodopi Mountain Range National Park (bear, deer, wild goat and roe deer habitat), starting and finishing at the Erymanthos Forest Village in Haidou, north of Stavroupoli; about 67% trail, 32% forest road and 1% asphalt, via Vathyrema, Prasinada, the Bardakova forest, Oxia, Zarkadia, Kaikouli, the Farasino and Krousovo streams, the Fraktos Forest Village, Anterorachi, Alikioi, the Mega Rema (Arkoudorema) and the shore of the Platanovrysi reservoir, then back via Zarkadia, Oxia, Silli, Prasinada and Theologos to the finish. The race starts at midnight between Thursday and Friday (00:00 on Friday). Six aid stations with full food, including vegetarian options (Prasinada-1 km 29, Zarkadia-1 km 57, Fraktos km 89, Anterorachi km 111, Zarkadia-2 km 138, Prasinada-2 km 152) and 25 checkpoints in total; checkpoints offer no food or drink. Four intermediate cut-offs, counted on departure from the station: Zarkadia-1 12 h, Fraktos 21.5 h, Zarkadia-2 32 h and Prasinada-2 37 h. Open to runners aged 20 and over who have finished a mountain/trail race of at least 80 km (50 miles) in 2025, 2026 or 2027, or dropped out after km 100 of a longer race; road races don't count. Categories: Men 20-49, Veteran Men 60+, Women 20-49, Veteran Women 50+. Mandatory gear: waterproof jacket, survival blanket, headlamp with spare batteries, small backup light, mobile phone, hydration pack or bottle, lighter or matches, food, first-aid kit, whistle, cup, long tights and gloves; gear is checked. Carry your own cup, since aid stations serve drinks only into it and bottles can't be filled with isotonic drinks. Two drop bags of your own (max 10 kg and 50 L each): one is available at Zarkadia (km 55 and again at km 134), the other at Fraktos (km 89); hand them in at the race office by 18:00 on Thursday. No pacers; outside help is allowed only inside the Zarkadia and Prasinada aid stations (reachable by car on asphalt), and friends and family may run alongside only for the last kilometre. Expect at least 12 hours of running in the dark even for the winner. No medical certificate or athletic card is required. Bib pickup on Thursday 08:00-23:00 at the race office in the Erymanthos Forest Village. The entry includes pre- and post-race meals, aid-station food, a souvenir gift, a finisher medal, bib, medical support, transport back to the start for runners who drop out, and bus transport to and from Haidou before and after the race; accommodation isn't included, but participants can camp for free at the Erymanthos Forest Village. Cancellations requested by email until registration closes get a 50% refund; after that only the event gift, and fees can't be moved to a later edition. No prize money: commemorative awards for the top 3 overall, the top 3 women, the first master man (60+) and master woman (55+), and 5-star and 10-star awards for 5 and 10 finishes. Payment by card at registration; if that fails, bank transfer to Piraeus Bank, IBAN GR29 0172 3520 0053 5204 7379 743, beneficiary RODOPI ULTRA TRAIL. Contact: info@rout.gr.