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There are six stages over the seven days, with the first three daily stages set around 20 miles each. The fourth stage is around 50 miles; the fifth stage is always a full marathon of 26.2 miles, and the sixth (and last) stage is from 9-12 miles.
The terrain at the MDS is not all giant sand dunes. In fact, most of the course is run over salt flats, dried up river beds, rocky desert plains, and ancient, dried up lakes. And, it is not uncommon for the course to wander through a remote desert village. The course is usually well marked and all competitors receive a "Road Book" which provides an official course description for each stage.
Temperatures can be extreme, with possible daytime highs reaching 125°F and night-time lows of 38°F. Additionally, the occasional sandstorm can add to the mix. Thus, competitors should be prepared for anything.
The race is entirly self sufficient with the exception of water and a tent over your head. This means I will be carrying all my food for the entire 7 days in my backpack, in addition to all my gear, sleeping pad, and sleeping bag.
More on the MdS later....