The patkai hills are the part of the purvachal range and they are located in the eastern fringes of the Indian subcontinent connecting with Mayanmar. The Patkai hills are crammed with conical peaks, steep slopes and deep valleys. The hills are not as rough as the Himalayas though they have resulted by the same tectonic processes like the Himalayas.

Under the Patkai range there are mainly three hills, namely The Patkai-Bum, the Garo-Khasi-Jaintia and the Lushai Hills. The Purvanchal range is the eastern extension of the Himalayas, the Shillong plateau in the northeastern part of India. The Purvancha ranges lie between the latitudes 21 o 5` - 28 o 23`N and longitudes 91 o 13` - 97 o 25`E, covering a total area of 108,229km2 consisting of Assam hills, Manipur, Meghalaya, Mizoram, Nagaland and Tripura. They were a result of the tectonic processes since ages.

The climate of the Patkai hills varies from temperate to alpine due to the different altitude. The Namdapha National Park is bordered by the Patkai hills in the south and south-east. This is an important tourist spot.