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The Koksoak River () is a river in northern Quebec, Canada, the largest river in the Nunavik region. The Inuit village and region's administrative centre Kuujjuaq lies on the shores of the Koksoak, about south from its mouth.
The name Koksoak is believed to originate from Moravian Church missionaries who evangelized among the Inuit of the area at the beginning of British rule and incorrectly spelled the Inuktitut word Kuujjuaq, meaning "great river." In the 19th century, the river was also known as Big or South River, taken from South Bay which was the name of Ungava Bay at that time. In 1916, the name Koksoak was officially adopted.
The Koksoak River arises at the confluence of its two main tributaries, the Rivière aux Mélèzes to the west and the Caniapiscau River to the south. The Koksoak River flows for about in an east-northeasterly direction into Ungava Bay, and passes by the village of Kuujjuaq, from where it flows northwards for about to the coast. The total length of the Koksoak River and its main tributary, the Caniapiscau River, is approximately and the size of the drainage basin is about . However, in 1985 the upper waters of the Canaipiscau River were diverted as part of the James Bay Project and about 45% of the waterflow of the Caniapiscau now flows through the Caniapiscau Reservoir and on into the LaForge and La Grande Rivers to the west. The catchment area of the Caniapiscau Reservoir is about .
The Koksoak river has an estimated mean discharge of approximately 55 km3 of water per year - though the absence of long streamgauging records means accurate data are not available. Most of the flow occurs during the early summer when the ice on the river thaws and snow in the Canadian Shield melts. The Koksoak River lies on the boundary between the northern limit of the taiga and the vast tundra expanses of the Ungava Peninsula to the north. All the Koksoak basin is covered with permafrost - discontinuous in the south and continuous in the north.
Although hunting activities and administrative services are a mainstay of life in Kuujjuaq, Adventure travel is expanding, centred mostly on caribou hunting as well as salmon, trout and Arctic char fishing.
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