ultra-distance

noun

(modifier) athletics covering a distance in excess of 30 miles, often as part of a longer race or competitionan ultra-distance runner

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012