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Aravalli Range & Hilly Region
Aravalli: The Aravalli Range is a range of mountains running approximately 692 km in a southwest direction, starting in North India from Delhi and passing through southern Haryana, through to Western India across the states of Rajasthan and ending in Gujarat.
The principal and most dominant mountain range of Rajasthan is the Aravalli range. The geological history of the Aravalli range can be traced back probably close of the Dharwar times.
Rajasthan is the largest state in the Union of India and has more physical variations than any other state. It has regions of rolling sand dunes in the west to lofty rocks in the middle to fertile plains in the east. This range runs diagonally across the state from northeast near delhi and extends to southwest up to the Plains of Gujarat for a distance of about 692 km. The range runs from Khetri in the northeast to Khed Brahma in the Southwest within Rajasthan for a length of about 550 kilometers. It is composed of rocks belonging originally to the Delhi system, folded in a synclinorium occupying the site of the geosynclines which have been deeply eroded.
The whole of this Aravalli range and Hilly Region has been further subdivided into two physiographic units:
(i) Aravali Range and Bhorat Plateau
This division constitutes east Sirohi, nearly the whole of Udaipur except a narrow belt in the east and whole of Dungarpur district.
The highest section of the Aravalli range known as ‘Bhorat’ Plateau lies northwest of Udaipur between Kumbhalgarh – Gogunda and the average elevation of this plateau is 1,225 metres.
(ii) North-Eastern Hilly Tract
Northern edge of Bhorat plateau marks the boundary of north eastern hilly tract in the southwest. North of Kumbhalgarh, especially at the Alwar hills the elevation varies between 550m to 670m.
Further north and northeast, the hills are broken and their elevation decreases in the final extension of hills south of delhi to about 306m above sea level. This level is about 60m to 90m above the surrounding plain.