posted on Jan, 20 2013 @ 06:06 AM
The top one looks like deep gorges to me.
Though there is this optical illusion that I saw in a book once, and it was a picture of a sphere that was the same color as the background, and had a
shadow with it. When viewed the right way up, it looks hollow. But when you turn the page upside down, it looks like it's popping out.
These parallel geographical features could be one or the other. Depends how you're looking at it.