Rainy Lake is part of an extremely large system of lakes forming the Hudson Bay drainage basin that stretches from west of Lake Superior north to the Arctic Ocean.
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He began his trek toward there following the route of Pierre Gaultier de Varennes et de La Vérendrye through Rainy Lake, Lake of the Woods and the Winnipeg River to Lake Winnipeg.
The name "Koochiching" comes from either the Ojibwe word Gojijiing or Cree Kocicīhk (recorded in some documents as "Ouchichiq"), both meaning "at the place of inlets," referring to the neighboring Rainy Lake and River.
Al Lindner, co-founder of In-Fisherman, has stated that Rainy Lake is his favourite smallmouth fishing destination.