Mathias Rousseau
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We stopped at this park on the last leg of our Gaspésie tour. We used the road that takes you pretty much at the top of the mount, where you will find a large parking lot to park. Then it's a couple minutes of walk to get to the belvedere and church that sits at the top of the mountain. You will also find a visitor center building and washrooms there.
The view from there is quite spectacular, giving you an overall view of the Baie des Chaleurs. The church is more of a contemporary style and offers a beautiful mosaic in its altar.
We took a trail down the mountain around the church which was actually a mountain bike trail, so not the best when you're walking/hiking (see map).
A nice place to stop to enjoy the view of the area that is quite magnificent.