North of Trois-Rivières, halfway between Montréal and Québec and accessible from Hwy. 55, La Mauricie National Park (Parc national de la Mauricie) is an unspoiled area in the Laurentian Mountains that occupies 536 square kilometres (206 sq. mi.) in the St. Maurice Valley. The park overlies bedrock dating from the Precambrian era, which began about 980 million years ago. Learn More...