Deserts are separated into four categories: subtropical, cool coastal, cold winter and polar. Each race in the 4 Deserts Ultramarathon Series is located in the largest desert of each category, also representing the driest, hottest, coldest and windiest places on Earth.
The Gobi Desert is the largest cold winter desert. A cold winter desert is created by the rain shadow effect in which a tall mountain range causes warm, moist air to rise and cool. As the air cools, water vapour condenses out and falls as rain or snow, leaving the air dry and creating a desert on the lee (upwind) side of the mountain.
The course for the Gobi March (Mongolia) has been set up to pass through some of the most beautiful, pristine and untouched land on Earth.