The Mare Orientale is one of the more remarkable features of our Moon. Mare Orientale is multi-ring impact basin that is located on the extreme western edge making it very had to see from our perspective from Earth. This basin is over 3 billion years old and about 600 miles across. It is believed that an asteroid sized object made this basin. The powerful collision created ripples resulting in its concentric structure.
http://apod.nasa.gov/apod/ap110312.html
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