[2][1][8] The Sault Plat River flows in a trough-like shape carved into the rock of the Canadian Shield by the passage of glaciers during the last glaciation.The erosion marks due to the mechanical abrasion of the ice, the grooves, are up to 5 metres wide, the depth generally corresponds to a third of the width.

Upstream, with an average altitude of up to 300 m, the piedmont zone divides the dominant physiography and corresponds to the rest of the catchment area.

A series of giant glacial grooves located on the bed of the river near the mouth and visible from the Route des Baleines (138) is listed as an exceptional geological site.

An important migratory stopover for birds, the Côte-Nord offers many favourite sites to observe 350 listed species at leisure.

[12] Birding lists at the mouth of the Sault Plat River in 2021, 2020, 2016, by various field observers of eBird Quebec managed by QuébecOiseaux.