The hills of Karbi Anglong and Dima Hasao district and those in and around Guwahati and North Guwahati (along with the Khasi and Garo Hills) are originally parts of the South Indian Plateau system. These are eroded and dissected by the numerous rivers in the region. The average height of these hills in Assam varies from 300m to 400m to a maximum of about 2000m almost. There are also hills in the North Bank bordering Bhutan and Arunachal Pradesh as well as those near Burma.