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This region includes the Patkai,the Naga, the
Barail range, the highlands of Manipur, The Mizo Hills and Tripura ranges.
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This hilly tract is the southern extension of
the eastern Himalayan region and is characterised by relatively low relief.
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Most of the ranges have north-south alignment
and run parallely alternated by deep valley occupied by mountainous streams
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The general elevation of the ranges is 915 m fom
the sea level.
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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.
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The Blue mountain which is located in the Mizo Hills
has the height of 2158 m.
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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.
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The hills of the region are separated from one
another by narrow steep sided valley.
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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.
