The 30 metres (98 ft) Chute au Tonnerre (Thunder Falls) is 5 kilometres (3.1 mi) upstream from the mouth.

[3] The widening at the mouth, which is halfway between Sept-Îles and Havre-Saint-Pierre, forms a natural harbor for small craft that is accessed from the sea through a narrow channel.

[3] The southern portion of the "Tonnerre River" hydrographic slope is served by Route 138 along the north shore of the Gulf of Saint Lawrence.

[4] The Innu call the river U`suk `Sipo, meaning red-breasted merganser (Mergus serrator), a common bird species on the North Shore.

[6] A map of the ecological regions of Quebec shows the river basin is in sub-regions 6j-S, 6j-T and 6m-T of the east spruce/moss subdomain.