At the racetrack ( Hippodrome de Wallonie | Mons)
It is possible to bet on Belgian races, even if they serve to support bets in France but you can also bet on any other French race organized by other racetracks, whether they are French or foreign partners of the French PMU.
AR the racetrack
Either in bookstores or betting or horse agencies affiliated to Eurotiercé. Find here enclosed the differents point of sales: