<p><b><a href="//commons.wikimedia.org/wiki/Category:Black_Canyon" class="mw-disambig" title="Category:Black Canyon">Black Canyon</a></b> — on the <a href="//commons.wikimedia.org/wiki/Category:Colorado_River" title="Category:Colorado River">Colorado River</a> border between Nevada and Arizona, photographed in the direction of "Camp 7".
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<ul><li>Image by <a href="//commons.wikimedia.org/wiki/Category:Timothy_H._O%27Sullivan" title="Category:Timothy H. O'Sullivan">Timothy H. O'Sullivan</a>, from the 1871 <b><a href="https://en.wikipedia.org/wiki/Wheeler_Survey" class="extiw" title="w:Wheeler Survey">Wheeler Survey</a></b>.</li>
<li>Location of present day Hoover Dam and Lake Mead.</li></ul>
<bdi><a href="https://en.wikipedia.org/wiki/en:Timothy_H._O%27Sullivan" class="extiw" title="w:en:Timothy H. O'Sullivan"><span title="American photographer">Timothy H. O'Sullivan</span></a>
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1871
<a rel="nofollow" class="external text" href="https://arcweb.archives.gov/arc/basic_search.jsp">National Archives of the United States</a>. Still Picture Records LICON, Special Media Archives Services Division (NWCS-S), National Archives at College Park, 8601 Adelphi Road, College Park, MD 20740-6001 PHONE: 301-837-3530, FAX: 301-837-3621, EMAIL: stillpix@nara.gov . ARC Identifier: 524160. Local Identifier: 106-WB-57.