Weird terrain best describes this hilly, lineated region of <a href="https://en.wikipedia.org/wiki/Mercury_(planet)" class="extiw" title="en:Mercury (planet)">Mercury</a>. Scientists note that this area is at the antipodal point to the large <a href="https://en.wikipedia.org/wiki/Caloris_basin" class="extiw" title="en:Caloris basin">Caloris basin</a>. The shock wave produced by the Caloris impact may have been reflected and focused to the antipodal point, thus jumbling the crust and breaking it into a series of complex blocks. The area covered is about 800 km (497 mi) on a side.<br>The crater at left is now known as Petrarch.  This is based on Mariner 10 image 27299.
NASA/JPL
<p><b>Source</b>: <a rel="nofollow" class="external free" href="http://pds.jpl.nasa.gov/planets/captions/mercury/mercter.htm">http://pds.jpl.nasa.gov/planets/captions/mercury/mercter.htm</a><br></p>
Also appears at the NASA Planetary Photojournal: <a rel="nofollow" class="external free" href="http://photojournal.jpl.nasa.gov/catalog/PIA02445">http://photojournal.jpl.nasa.gov/catalog/PIA02445</a>