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Atchafalaya (əchăˈfəlĪˌə) [key], navigable river, c.170 mi (270 km) long, S central La. The Atchafalaya meanders south, in a former channel of the Mississippi, to the Gulf of Mexico. A distributary of the Red and Mississippi rivers, the Atchafalaya flows to the Gulf through an extensive system of guide levees and floodways. Important to the agriculture and energy industries of the region, the system serves as a flood control for the lower Mississippi, especially around New Orleans.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

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