Matamec River  The Matamec River () is a salmon river in the Côte-Nord region of Quebec, Canada. It empties into the Gulf of Saint Lawrence. The river was used for research into Atlantic salmon and brook trout by the Woods Hole Oceanographic Institution (WHOI) between 1966 and 1984. Today the southern part of the watershed is strictly protected by the Matamec Ecological Reserve.. The Matamec River is long. It rises near Lake Cacaoni and flows from north to south. It passes through Lake Matamec less than from its mouth. The river is rich in fish. The mouth of the river is in the municipality of Sept-Îles in the Sept-Rivières Regional County Municipality. The river enters Moisie Bay to the northeast of the community of Matamec. The river takes its name from the Innu language "matamek", meaning "trout". In an 1865 map of the canton of Moisie the Matamek River or Trout River is shown as the eastern boundary. The Geography Commission made the name Matamek River official in 1916. The form "Matamec River" was adopted in the early 1960s. The river basin cover . It lies between the basins of the Moisie River to the west and the Loups Marins River to the east. The basin is partly in the unorganized territory of Rivière-Nipissis and partly in the municipality of Sept-Îles. The basin is on Precambrian shield. The bedrock is close to the surface in the interior, but is overlain by marine deposits in the coastal plain. The bedrock is in the Grenville Province. Metamorphic rock is gneiss, granitic gneiss and paragneiss Igneous rock is anorthosite, gabronite and granite. During the last ice age the area was covered in ice until around 9,000 years age, which left deposits of glacial till of varying depths throughout the region. When the icecap retreated the south of the basin was covered by the Goldthwait Sea to a maximum depth of . The sea retreated as the land rebounded from the weight of the ice, leaving deposits of sea clay in the lowlands, often now covered with ombrotrophic peat bogs. The Matamec watershed contains 31 lakes, ponds and bogs. Rivers and lakes are oriented along fracture zones, faults and breaks in the bedrock, and are usually surrounded by steep, rocky hillsides.