An 1855 U.S. Coast Survey nautical chart or map of the Mississippi River Delta and environs.  Centered on the fanlike river delta itself, this map extends westward as far as Marsh Island and Vermillion Bay and eastward along the Mississippi Sound as far as Mobile Bay, Alabama.  The course of the Mississippi River is charted as far north as New Orleans and Lake Pontchartrain.  Countless triangulation points are noted throughout, particularly in Cote Blanche Bay, the Mississippi River Delta, the Mississippi Sound, and Mobile Bay.  The chart was produced under the supervision of A. D. Bache, one of the most influential and prolific Superintendents of the U.S. Coast Survey.
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<a href="https://en.wikipedia.org/wiki/United_States_Coast_Survey" class="extiw" title="en:United States Coast Survey">United States Coast Survey</a></div>
1855 (dated)
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