The territory's largest lake is the eponymous Lake Pikauba. This toponym comes from the Montagnais word Opikopau. Opi is a root to indicate that something is enclosed or confined. Kopau describes a lake with alders, reeds, or other. So Pikauba may be translated as "lake narrowed by Alders". The map of provincial surveyor Frederic William Blaiklock from 1852 referred to this lake by the name Chicoutimi Lake.[4]