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Robert A. Muller
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LOCATION: Baton Rouge, LA, United States
Professor of Geography and Anthropology; Director, Southern Regional Climate Center, Louisiana State University, Baton Rouge. Coauthor of Physical Geography Today and others.
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![Lake Itasca](https://cdn.britannica.com/62/117862-050-64F1DE20/Lake-Itasca-State-Park-Minnesota.jpg?w=320&h=240)
Mississippi River, the longest river of North America, draining with its major tributaries an area of approximately 1.2 million square miles (3.1 million square km), or about one-eighth of the entire continent. The Mississippi River lies entirely within the United States. Rising in Lake Itasca in…
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