<P> Much of the land of Central Asia is too dry or too rugged for farming . The Gobi desert extends from the foot of the Pamirs, 77 ° E, to the Great Khingan (Da Hinggan) Mountains, 116 °--118 ° E . </P> <P> Central Asia has the following geographic extremes: </P> <Ul> <Li> The world's northernmost desert (sand dunes), at Buurug Deliin Els, Mongolia, 50 ° 18 ′ N . </Li> <Li> The Northern Hemisphere's southernmost permafrost, at Erdenetsogt sum, Mongolia, 46 ° 17 ′ N . </Li> <Li> The world's shortest distance between non-frozen desert and permafrost: 770 km (480 mi). </Li> <Li> The Eurasian pole of inaccessibility . </Li> </Ul> <Li> The world's northernmost desert (sand dunes), at Buurug Deliin Els, Mongolia, 50 ° 18 ′ N . </Li>

Which asian region is called the land of great rivers