Start and finish at Stavros harbor. Field capped at 100 runners across both distances (50 per distance); a waiting list applies once full, and only paid entries count. Minimum age 18, or 15-17 with notarized parental consent submitted at bib pickup. Runners must carry their own cup/bottle - no disposable cups at aid stations, since water comes from the island's only spring. Entry fee covers race entry, aid station support, finisher medal and a light meal at the finish. Medical coverage on course, but no hospital on the island. Awards: top 3 men and top 3 women in the 18-50 category, plus top 3 men and top 3 women in the 50+ category. Route in four sections: Stavros to the Papas summit (385m, checkpoint) and on to Kalotaritissa; a loop out to the "Fanari" lighthouse on the island's rugged north-east tip (checkpoint, km8) and back to Kalotaritissa; Kalotaritissa to Mersini via a paved climb to 240m; a new-for-2026 final section via Livadi, Vathy Limenari and Kedros beaches before the last climb back to Stavros. About 5 water stations along the route. Co-organized with the Association of Donoussa Islanders of the Cyclades, the Donoussa Professionals' Association, the South Aegean Region, the Municipality of Naxos and Lesser Cyclades, and the Municipal Community of Donoussa. Contact: 6982953374, monopatiadonoussas@gmail.com.