High Fells of Rhudaur

The High Fells of Rhudaur is a location of Middle Earth that only existed in the Peter Jackson movie trilogy of The Hobbit. It was first mentioned by Lady Galadriel as the location where the Witch King (along with his Morgul Blade) was buried after Angmar fell. According to an early clip of the soon to be released Desolation of Smaug, Gandalf and Radagast investigate the High Fells, revealing that it is also the location where the other Ringwraiths were buried. The wizards find all the crypts are broken and empty.

Reference
1. http://www.traileraddict.com/clip/the-hobbit-the-desolation-of-smaug/high-fells