The park has several peat bogs typical of the boreal forest as well as an abundant population of moose and beavers.

The park is managed by the Quebec government through the Société des établissements de plein air du Québec (SÉPAQ).

The Île Bouliane, owned by Frenchman Paul-Augustin Normand, was a prosperous farm with more than 125 employees who won numerous agricultural awards.

[4] On 22, the Minister of Sustainable Development, Environment and Parks, announced that public consultations would be held to include the islands of Lac Saint-Jean west of Alma and Saint-Gédéon.

[5] In January 2017, the park area increased from 92.2 km (57.3 mi) to 97.5 km (60.58 mi) by adding land to the park in Saint-Henri-de-Taillon, Saint-Gédéon and Alma including thirty islands and islets on Lac Saint-Jean.