Agwo Facula, interpreted as a pyroclastic vent (<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/2009E&amp;PSL.285..263K">Kerber et al., 2009</a>), on <a href="https://en.wikipedia.org/wiki/Caloris_Planitia" class="extiw" title="en:Caloris Planitia">Caloris Planitia</a> on Mercury. Photo by <a href="https://en.wikipedia.org/wiki/MESSENGER" class="extiw" title="en:MESSENGER">MESSENGER</a>, made by Narrow Angle Camera (MDIS-NAC) on 3 August 2011 from altitude about 680 km. Judging from search results on the site <a rel="nofollow" class="external free" href="https://pilot.wr.usgs.gov">http://pilot.wr.usgs.gov</a>, it is the most detailed photo of this feature. Sun elevation is 6.3°. Width of the photo is about 22 km, north is to the up.
NASA
Image <a rel="nofollow" class="external text" href="http://global-data.mars.asu.edu/bin/viewer/main.php?inst=MDIS&amp;id=EN0220850481M">EN0220850481M</a> by <a href="https://en.wikipedia.org/wiki/MESSENGER" class="extiw" title="en:MESSENGER">MESSENGER</a>.