noun
ultramarathon
A running race longer than a standard marathon (42.195 km). Common distances include 50 km, 100 km, and 100 miles.
彼は今年、初めてのウルトラマラソンに挑戦する。
He will attempt his first ultramarathon this year.
ウルトラマラソンは過酷なレースだが、完走したときの達
An ultramarathon is a grueling race, but the sense of accomplishment upon finishing is immense.