Southeastern Hill Ranges

-      This region includes the Patkai,the Naga, the Barail range, the highlands of Manipur, The Mizo Hills and Tripura ranges.

-      This hilly tract is the southern extension of the eastern Himalayan region and is characterised by relatively low relief.

-      Most of the ranges have north-south alignment and run parallely alternated by deep valley occupied by mountainous streams

-      The general elevation of the ranges is 915 m fom the sea  level.

-      There are a few notable peaks namely Saramati (3827 m) and Japvo Peaks (2914 m) in the Naga Hills and Noi-Isong (3777 m) at the syntaxial bend.

-      The Blue mountain which is located in the Mizo Hills has the height of 2158 m.

-      The whole region is very much unstable and falls into an important seismic zone and as a result of this, the area is criss-crossed by several faults and strikes. The most important which are Naga thrust, Haflong -Disang and Dawki -Tear thrust.

-      The hills of the region are separated from one another by narrow steep sided valley.

-      Generally the valley bottoms are conspicuous by the presence of gravels, boulders and other transported materials. The valley side ridges are clothed with tall vegetation, while the peaks of the ridges are covered by grassy vegetation.