Missinaibi River

The Missinaibi River is a river in northern Ontario, Canada, which flows northeast from Missinaibi Lake, north of Chapleau, and empties into the Moose River, which drains into James Bay. This river (including Missinaibi Lake and Moose River to James Bay) is 755 kilometres (469 mi) in length. It is one of the longest free-flowing and undeveloped rivers in Ontario. The river's name (masinâpôy sîpiy, ᒪᓯᓈᐴᔾ ᓰᐱᔾ) means "pictured waters" in the Cree language which is thought to refer to the pictographs found on rock faces along the river. At Thunderhouse Falls, which is actually a chain of relatively small waterfalls connected by violent rapids, the river drops 40 metres, part of its descent from the Canadian Shield to the Hudson Bay Lowlands.