MUM (Moravian ultra marathon) is an international running stage race, which is almost 7 marathons in 7 consecutive days. It is the longest running and most difficult stage race held in the Czech Republic.

Each stage, called Marathon (due to the length of more than 42,195 meters of classical), is the rugged terrain, and her profile includes an average of 900 m climb, definitely more challenging than other races organized by the Czech Republic.