Rocher Lake (Nipukatasi River)

Lake Rocher receives from the South side the waters of the Nipukatasi River whose main lake is the Amisquioumisca Lake. Lake Rocher is part of a group of lakes in the same area, generally formed in length, more or less parallel to each other, including Ouescapis Lake, Quénonisca Lake, Salamandre Lake (Broadback River), Opataouaga Lake and Amisquioumisca Lake. While on the west side, the major body of water is Evans Lake.

Lake Rocher has a length of 27.1 kilometres (16.8 mi), a width of 2.7 kilometres (1.7 mi), an altitude of 255 kilometres (158 mi) and an area of 45.79 square kilometres (17.68 sq mi). Made long by the widening of the Nipukatasi River, this lake has 17 islands and a few bays.

The surrounding areas near the lake have a generally leveled topography, except Mount Dome whose summit culminates at 381 metres (1,250 ft) at 3.6 kilometres (2.2 mi) north-west of the lake. This summit is equidistant from Quénonisca Lake, which is a neighboring body of water to the northwest.

The mouth of Lake Rocher is located at:

• 24.2 kilometres (15.0 mi) south of Théodat Lake;
• 10.7 kilometres (6.6 mi) Southwest of the mouth of the Nipukatasi River (confluence with the Broadback River);
• 55.8 kilometres (34.7 mi) south-east of the mouth of Evans Lake which is crossed by the Broadback River;
• 194 kilometres (121 mi) south-east of the mouth of the Broadback River (confluence with Rupert Bay);
• 136.7 kilometres (84.9 mi) north-east of downtown Matagami;
• 161.3 kilometres (100.2 mi) north-west of downtown Chibougamau.

The lake Rocher Lake empties on the northeast side by the Nipukatasi River whose course flows over 4.1 kilometres (2.5 mi) north-east into a marsh zone to a lake unidentified (length: 6.4 kilometres (4.0 mi); altitude: 253 metres (830 ft)) that the current flows through to its full length. Then, the current continues northward on the 2.9 kilometres (1.8 mi) in the marsh zone, until the confluence of the Nipukatasi River which flows on the South shore of the Broadback River. From there, the current flows westward along the Broadback River over 15.3 kilometres (9.5 mi) to the east shore of Corbeau Bay, which is an extension of the Evans Lake. Downstream of Evans Lake, the current flows westward to the eastern shore of Rupert Bay.

• Rupert Bay
• Broadback River, a watercourse
• Evans Lake, a body of water
• Nipukatasi River, a watercourse
• Eeyou Istchee James Bay (municipality)
• List of lakes in Canada