Ultra-Trail Kosciuszko in 2023, a running event organized in Thredbo (Australia) from 7 / 9 December. During the 4 races were held event. Course 50k (⨦ 50 km / + 1 950 m) in class RMT4 with average terrain slope 4% (G4). Course 25k (⨦ 27 km / + 1 100 m) in class RMT2 with average terrain slope 4% (G4). Course 165k (⨦ 163.5 km / + 5 050 m) in class RMT7 with average terrain slope 3% (G3). Course 105k (⨦ 105.5 km / + 3 250 m) in class RMT6 with average terrain slope 3% (G3).