Pyramid of Hawarra
Amenemhet III was the last powerful ruler of the 12th Dynasty, and the pyramid he built at Hawarra, near Faiyum, is believed to post-date the so-called “Black Pyramid” built by the same ruler at Dahshur. It is the Hawarra pyramid that is believed to have been Amenemhet’s final resting place.
Source: http://en.wikipedia.org/wiki/Egyptian_pyramids