Punters set to stake €100m
Punters are expected to gamble up to €100m on Cheltenham.
Around 15,000 Irish racegoers are expected to attend.
"We received the highest ever number of entries for Irish horses for the festival," said Cheltenham Racecourse spokesman Andy Clifton. "Obviously the number of entries doesn't mean they will all race; some are entered for more than one race. But 599 Irish entries is definitely a record."