Maps of the Mississippi Embayment region.

<p>A. Map of the eastern U.S. illustrating the location of the Mississippi Embayment relative to the Appalachian, Ozark, and Ouachita Highlands. Dashed line represents approximate extent of the Coastal Plain. Black rectangle inset indicates outline of area highlighted in section B. Data available from the U.S. Geological Survey. B. Map of major river drainages in the Mississippi Embayment region. Abbreviations as follows: AM, Amite River; AR, Arkansas River; BB, Big Black River; BP, Bayou Pierre; BR, Buffalo River, BS, Big Sandy River; CC, Coles Creek; CR, Coldwater River; CU, Cumberland River; FD, Forked Deer River; HR, Homochitto River; HT, Hatchie River; LI, Little River; LR, Loosahatchie River; MO, Missouri River; MR, Mississippi River; OB, Obion River; OR, Ohio River; OU, Ouachita River; PR, Pearl River; LT, Little Tallahatchie; RR, Red River; TR, Tennessee River; WR, Wolf River; WT, West Fork Thompson Creek; YA, Yalobusha River; YZ, Yazoo River; YO, Yocona River. Colored regions correspond with color coding used to designate clades in Figs <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0116719#pone.0116719.g003" target="_blank">3</a>–<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0116719#pone.0116719.g005" target="_blank">5</a>.