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Lake Michigan–Huron
Lake Michigan–Huron (also Huron–Michigan) is the combined waters of Lake Michigan and Lake Huron, which are joined through the wide, 20-fathom (120 ft; 37 m) deep, open-water Straits of Mackinac. Huron and Michigan are technically a single lake because the flow of water through the straits keeps their water levels in near-equilibrium. (Although the flow is generally eastward, the water moves in either direction depending on local conditions.) Combined, Lake Michigan–Huron is the largest fresh water lake by area in the world. If Lake Huron and Lake Michigan are considered two separate lakes, Lake Superior is larger than either.
== Bathymetry and hydrology ==
The connection between Lake Michigan and Lake Huron through the Straits of Mackinac is wide and deep.〔"(Michigan and Huron: One Lake or Two )?" Pearson Education, Inc: Information Please Database, 2007.〕 This depth compares with the maximum depths of in Lake Huron and in Lake Michigan. Although the Straits create a pronounced bottleneck in the contours of the shoreline and a major constriction in the local bathymetry, defining two distinct basins, they are still deep and wide enough to allow free exchange of water between the two sides. Because of the link through the Straits, Lakes Michigan and Huron have the same mean water level (in June 2015 it was ).
The largest inflow to the system is the St. Mary's River from Lake Superior, and the main outflow is the St. Clair River to Lake Erie; both lie in the Lake Huron basin.〔 The combined effects of seiches (resonant standing waves)〔James H. Saylor & Peter W. Sloss, 1976, (Water Volume Transport and Oscillatory Current Flow through the Straits of Mackinac ), Journal of Physical Oceanography, v. 6, p. 229-237〕 and of differing weather conditions (atmospheric pressure, wind) over each basin act to drive water either way through the Straits on a variety of characteristic timescales, at amounts sometimes exceeding for several hours in either direction.〔 However, the long-term average flow through the Straits is eastwards at .〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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