the ocean currents.
<p>Note that 
</p>
<ul><li>E. Greenland + Labrador + Norwegian = Viking gyre</li>
<li>Gulf stream + N. Atlantic Drift + Canary + N. Equatorial = Columbus gyre</li>
<li>S. Equatorial + Brazil + South Atlantic + Benguela = Navigator gyre</li>
<li>S. Indian + S. Equatorial + Mozambique + W. Australia = Majid gyre</li>
<li>Alaska + N. Pacific + Oyashio = Aloet gyre</li>
<li>Kuroshio + N. Equatorial + California = Turtle gyre</li>
<li>Peru + S. Pacific + E. Australia = Heyerdahl gyre</li></ul><p>Finally, a few gyres also exist at the poles (not shown at this map); these are:
</p>
<ul><li>North Pole: Polar bear gyre, Storkerson gyre, Melville gyre</li>
<li>South Pole: Penguin gyre</li></ul>
References for the currents: <a rel="nofollow" class="external text" href="https://www.wired.com/special_multimedia/2009/st_infoporn_1704">Curtis Ebbesmeyer map at Wired</a>
Dr. Michael Pidwirny (see <a rel="nofollow" class="external free" href="http://www.physicalgeography.net">http://www.physicalgeography.net</a>)
2007-08-10
<a rel="nofollow" class="external free" href="http://blue.utb.edu/paullgj/geog3333/lectures/physgeog.html">http://blue.utb.edu/paullgj/geog3333/lectures/physgeog.html</a>, <a rel="nofollow" class="external text" href="http://skyblue.utb.edu/paullgj/geog3333/lectures/oceancurrents-1.gif">original image</a>