Cyprus Backyard Ultra (CBU) is the island’s only official Backyard Ultra endurance race and the only ultramarathon event of its kind in Cyprus , held annually in the Larnaca region. The race follows the internationally recognized format created by Lazarus Lake (USA), where athletes must complete a 6.706 km loop every hour, on the hour, until only one runner remains. There is no predefined distance or time limit. The race continues for as long as participants can endure, testing both physical and mental strength. Any runner who fails to complete a loop within the hour is eliminated, making this one of the most unique and demanding formats in endurance sports. The course takes place on scenic trail routes with natural terrain, offering panoramic views and a challenging elevation profile, while remaining accessible for both participants and spectators. CBU has developed a strong international character , attracting 100+ athletes from 18 countries in its latest edition. The steadily increasing participation and performance levels highlight the rapid growth of ultra running in Cyprus and position the event as a key destination for endurance athletes. The race is officially listed on the global Backyard Ultra platform, with results published on international databases such as DUV Ultra Marathon Statistics, and contributes to national team selection for the Backyard Ultra World Team Championships.