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The Mattawa River is a river in central Ontario, Canada. It flows east from Trout Lake east of North Bay and enters the Ottawa River at the town of Mattawa. Counting from the head of Trout Lake, it is 76 km in length. The river's name comes from the Algonquin word for "meeting of waterways". Two provincial parks are located along it: the Mattawa River Waterway Provincial Park stretches along both sides of the river's banks for almost its full length; and Samuel de Champlain Provincial Park, located about 10 km from the river's end. ==Geography== The river follows inside an ancient fault line through the Algoma Highlands called the Mattawa Fault. This fault line marks the northern edge of an ancient rift valley, called the Ottawa-Bonnechere Graben, and still causes minor earthquakes in the area.〔Canadian Heritage Rivers System: Mattawa River fact sheet, Ministry of Natural Resources ((Online version ))〕 From Lake Talon to Mattawa the river flows through a rock-walled canyon up to in places. Tributaries include the: * Amable du Fond River * Kaibuskong River * North River An interesting feature is the ''Porte de l'Enfer'' (Hell's Gate). This is a peculiar cave in the river's bank speculated to be a native ochre mine. As far back as 1761, Alexander Henry the elder reported on this cave and the myths surrounding it. It was said to be inhabited by an evil and fierce demon, hence its name.〔Hap Wilson, ''Rivers of the Upper Ottawa Valley'', 1993, ISBN 1-895465-05-2〕 Evidence of a post-glacial spillway which drained the Great Lakes into the Ottawa River until about 4000 years ago can be seen at several sites along the river. There are potholes at Portage de Talon and numerous cataracts and former river channels, such as the boulder pavement between Pine Lake and McCool Bay, 12–15 metres (39–49 ft) above the river's present day water-line.〔http://www.chrs.ca/Rivers/Mattawa/Mattawa-F_e.php〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mattawa River」の詳細全文を読む スポンサード リンク
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