steeplechase

Concise Oxford English Dictionary © 2008 Oxford University Press:
steeplechase/ˈstiːpltʃeɪs/

▶noun a horse race run on a racecourse having ditches and hedges as jumps.

■ a running race in which runners must clear hurdles and water jumps.

– derivatives
steeplechaser noun,
steeplechasing noun.

– origin C18: from steeple (because orig. a steeple marked the finishing point across country) + chase1.