The Empire of Oman around the middle of the 19th century
<a href="//commons.wikimedia.org/wiki/User:ArnoldPlaton" title="User:ArnoldPlaton">ArnoldPlaton</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>, based on the maps found <a rel="nofollow" class="external text" href="http://fanack.com/countries/oman/basic-facts/">here</a> and <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/salah/2148033626/in/faves-48609030@N02/">here</a>