Irregular depression, interpreted as a volcano (<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/2009E&amp;PSL.285..263K">Kerber et al., 2009</a>), on southwestern <a href="https://en.wikipedia.org/wiki/Caloris_Planitia" class="extiw" title="en:Caloris Planitia">Caloris Planitia</a> on Mercury. These features are now called Agwo Facula and Abeeso Facula (<a rel="nofollow" class="external text" href="https://planetarynames.wr.usgs.gov/images/H-4.pdf">map</a>).  Photo by <a href="https://en.wikipedia.org/wiki/MESSENGER" class="extiw" title="en:MESSENGER">MESSENGER</a> (2008).
NASA (photo by <a href="https://en.wikipedia.org/wiki/MESSENGER" class="extiw" title="en:MESSENGER">MESSENGER</a>)
<a rel="nofollow" class="external free" href="http://photojournal.jpl.nasa.gov/catalog/PIA11013">http://photojournal.jpl.nasa.gov/catalog/PIA11013</a> (<a rel="nofollow" class="external text" href="http://messenger.jhuapl.edu/gallery/sciencePhotos/image.php?image_id=199">other link</a>)