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In page Pine Bluff, Arkansas:

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Pine Bluff is on the Arkansas River; the community was named for a bluff along that river. Both Lake Pine Bluff and Lake Langhofer are situated within the city limits, as these are bodies of water which are remnants of the historical Arkansas River channel. (The former is a man-made expansion of a natural oxbow; the latter was created by diking the old channel after a man-made diversion.) Consequently, the Mississippi Alluvial Plain (or the Arkansas Delta) runs well into the city with Bayou Bartholomew picking up the western border as a line of demarcation between the Arkansas Delta and the Arkansas Timberlands.[citation needed]