The St-Hilaire mountain is one of the highest Monteregian hills ; it has an altitude of 414,2 metres (1358 feet). It is surrounded mainly by "le Chemin panoramique de la Montagne", a road lined with centenial houses.

This mountain had many names. At first, it was called Chambly like the river of the same name. The successive lords of Rouville tried to give it their names, but when the Saint-Mathieu-de-Beloeil parish was founded, it was named Beloeil, a name for which it seems predestined. However, when St-Hilaire became ville de Saint-Hilaire, the mountain became officially known as "mont Saint-Hilaire" (St-Hilaire mountain). Many legends were born from this history rich mountain. It has also seen memorable times. In 1841, an hundred feet high cross was erected at its top. The most daring people could climb inside up to the top and look outside through the windows. It was there five years before an hurricane tore it down, but the chappel at its base stayed up until 1877.