This is an 1853 triangulation chart of Biscayne Bay, Key West, Bahia Honda, the Cedar keys and the Dry Tortugas produced by the U.S. Coast Survey.  Essentially five maps compiled onto a single sheet.  Upper left map focuses on Key West, Florida, and the surrounding islands.  Upper right map details Key Biscayne Bay, just south of Miami and north of Key Largo.  Other maps show the Cedar keys, the Dry Tortugas and Bahia Honda.  Prepared under the supervision of A. D. Bache for the 1853  Report of the Superintendant of the U.S. Coast Survey .
<div class="fn value">
<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>
1853 (dated)
This file was provided to Wikimedia Commons by <a rel="nofollow" class="external text" href="http://www.geographicus.com/">Geographicus Rare Antique Maps</a>, a specialist dealer in rare maps and other cartography of the 15th, 16th, 17th, 18th and 19th centuries, as part of a <a href="//commons.wikimedia.org/wiki/Commons:Geographicus" title="Commons:Geographicus">cooperation project</a>.