Lake Abitibi (French: Lac Abitibi) is a lake in northeastern Ontario and western Quebec, Canada. The lake, which lies within the vast Clay Belt, is separated in two distinct portions by a short narrows, making it actually 2 lakes. Its total area is 931 km², and net area 903 km². The lake is shallow and studded with islands. Its shores and vicinity are covered with small timber.Its outlet is the Abitibi River, a tributary the Moose River, which empties into James Bay.