The Aravalli Ranges are one of the most ancient mountain ranges in India that lies in the north-western part of the country. It separates the sandy desert of west Rajasthan
and the fertile tracts in the eastern parts of the State. The present Aravalli ranges comprise only a part of the gigantic system that existed in pre-historic times. The entire ranges once rose to stupendous heights nourishing glaciers which in turn fed many great rivers. The ranges are now crossed by many rivers including Luna and the Banas
. Luna and and its small tributaries flow westward and in due course merge with
Rann of Kutch
, and the Banas and its streams flow from the easternside of the ridge and join the Yamuna. Aravallis are also gifted with great mineral wealth.