Arnprior.

Immediately south of downtown sits Gillies Grove, an old-growth eastern white pine forest on Nature Conservancy of Canada land within the municipal boundary. NCC reports a documented tree in the grove at roughly 47 metres — one of the tallest known eastern white pines in Ontario — and walking trails wind through old-growth pine and mixed forest with interpretive signage.

The Algonquin Trail — the eastern segment of the Ottawa Valley Recreational Trail on the former Canadian Pacific Railway corridor — passes through Arnprior with a town trailhead, linking eastward toward Smiths Falls and westward toward Mattawa. The Arnprior & McNab/Braeside Museum on Madawaska Street interprets the McLachlin Brothers lumber era and the Gillies family backstory tied to the grove.

Arnprior sits on the traditional territory of the Algonquin Anishinabeg.