By itself, any of the 4 Deserts races would be one of the longest ultramarathons in the world. Put together, the four events make up a series that challenges even the most elite long-distance competitors. This title introduces readers to these events, which take place throughout the year in South America, Africa, Asia, and Antarctica. The title features informative sidebars, exciting photos, a map, a glossary, and an index. SportsZone is an imprint of Abdo Publishing, a division of ABDO.