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The Athabasca River is Alberta's longest river. The first 168 km originates in Jasper National Park and is designated as a Candian Heritage River. The river flows approximately 1,500 km (935 mi) northeast through the province to Lake Athabasca in Wood Buffalo National Park. As a tributary to the Mackenzie River, water flowing on the Athabasca River eventually drains into the Arctic Ocean. River flow is highest during the summer and lowest during winter, and it is ice-covered from mid-November to mid-April.
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