Much of Mongolia is made up of the Gobi DESERT, a 4-letter word, and the STEPPE, a 6-letter word. The Gobi DESERT is a large DESERT in East Asia that covers parts of northern and northwestern China and southern Mongolia. It is the world's fifth-largest DESERT and is known for its extreme temperatures and dryness. The STEPPE is a vast grassland plain that stretches from Ukraine across Russia and Kazakhstan into Mongolia and northern China. It is characterized by low rainfall and cold winters. Together, the Gobi DESERT and the STEPPE make up the Gobidesert, a 10-letter word, which covers much of Mongolia.