I would have guessed it was a mountain range from an LoTR map, e.g. http://www.lord-of-the-rings.org/collections/maps/map6%5B1%5D.jpg http://www.lord-of-the-rin

I would have guessed it was a mountain range from an LoTR map, e.g. http://www.lord-of-the-rings.org/collections/maps/map6%5B1%5D.jpg http://www.lord-of-the-rings.org/collections/maps/map6%5B1%5...