Pirin Ultra is a mountain ultramarathon held in the heart of Pirin National Park. The park is part of UNESCO World Heritage list and it offers extremely suitable terrain for skyrunning, as well as amazing, breathtaking views. Pirin Ultra was first conducted in 2016 and 2017 and it accomplished great success among runners, visitors and all mountain running fans. With a length of 160 km and 66 km, and a denivelation of 10000 m, Pirin Ultra has definitely turned into the hardest ultramarathon, organized in Bulgaria. The third edition of Pirin Ultra will be held from the 4th to the 7th of October 2018 and it will be part of the Migu Run Skyrunner World Series - the World Cup in Skyrunning. The 66 km Start will be the 8the Final start in the Sky Extra discipline.