|Côte-Nord in Québec (Canada)
|Altitude above sea level
Lac Opiscotéo is located in central Labrador 75 km northwest of Fermont . The lake is in the area of the Canadian Shield at an altitude of . Lac Opiscotéo is located on the upper reaches of the Rivière Caniapiscau not far from its headwaters . The Rivière Caniapiscau meets the lake coming from the south and leaves it on its northwestern bank to the neighboring lake Lac Raimbault . The Lac Opiscotéo is interspersed with many small islands. It has a length of 35 km and a width of about 22 km.
The name of the lake is derived from the Montagnais word for “where it thundered”.