Parry Channel in the Canadian Arctic Archipelago, as seen by Envisat's ASAR on 25 August 2008, when the direct Northwest Passage was open (right image), and on 22 September 2008 when sea ice is closing the direct Northwest Passage.
<div class="fn value">
Envisat satellite</div>
CC BY-SA 3.0 igo
<a rel="nofollow" class="external free" href="http://www.esa.int/spaceinimages/Images/2008/10/Northwest_Passage">http://www.esa.int/spaceinimages/Images/2008/10/Northwest_Passage</a>