The Araignées River flows in the municipalities of Saint-Augustin-de-Woburn and Frontenac, in the Le Granit Regional County Municipality (MRC), in the administrative region of Estrie, in Quebec in Canada.

The "rivière aux Araignées" originates near the summit of Mont Pisgah on the Canada–United States border, or 0.4 kilometres (0.25 mi) north of the Canadian-American border.

The river is joined by several streams that drain the western flank of Mont Merrill, Caribou Mountain and several border mountains between Quebec and Maine (United States) which surround a valley which constitutes its watershed, drained by several branches of the Chutes brook, the Caribou brook and the Cascades brook.

Upper course of the river (segment of 21.2 kilometres (13.2 mi)) From its source, the "rivière aux Araignées" flows over: Lower course of the river (segment of 3.5 kilometres (2.2 mi)) From lac aux Araignées, the river takes the name of discharge of lac aux Araignées[2] and flows to: The rivière aux Araignées watershed, which is 437.9 kilometres (272.10 mi) and that of the Arnold River with 265 kilometres (164.66 mi) meet in the landfill lac des Joncs,[3] before reaching lake Mégantic.

The toponym "rivière aux Araignées" was made official on December 5, 1968, at the Commission de toponymie du Québec.