The Pyramid of Khafre: Khafre was one of Khufu's successors and although he had his pyramid built slightly smaller than that of Khufu, it was built on higher ground, to appear larger than it is.
Here is some additional information that you might find interesting about this pyramid: The Pyramid of Khafre
This challenge has a starting point of 6km on the first day and reaches the peak at 19km. This will certainly be a challenge for even seasoned runners as the middle portion of this option will throw a lot of high volume days in a row at the participants. However, just as the distance slowly increased, after the mid-way point, it will start to taper off again. The total distance for this challenge is 350km for the month.