Start and finish at Miaouli Square, Ermoupoli. 2.5-hour time limit. 550m total elevation gain. Terrain: 90% cobblestone alleys, trails, and stairs, 10% asphalt. Co-organized with the Municipality of Syros-Ermoupoli and the Local Community of Ano Syros. Categories: 18-34, 35-44, 45-54, 55+ (men/women). Top 3 men and women awarded a trophy, finisher medal for all. Registration limit: 170 paid entries. Also available: +UP/-DOWN point-to-point trail race (2.5km) on Sunday. Payment via Piraeus Bank, IBAN: GR56 0171 6730 0066 7313 8086 476 (beneficiary: Syros Runners). BIB pickup: Saturday 11:00-17:00 at Miaouli Square. Technical briefing 15 min before start. Awards ceremony at 20:00. Minors allowed with guardian consent. Contact: Isidoros Palamaris +30 6936691747, Alexandros Kontizas +30 6944390745, syrosrunners@gmail.com. Facebook: ΔΡΟΜΕΙΣ ΣΥΡΟΥ & Syros Trail Challenge.