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Aravalli Range is a range of mountains running approximately 692 km in a south west direction. The Aravalli range runs parallel to the moisture laden south west monsoon winds. It divides Rajasthan on the basis of rainfall. Eastern part receives more rainfall while western part receives less rainfall. In the southern Aravalli the mountains have slight east-west span thus receiving good rains in this region. The southern Aravalli are much greener than northern part. Precipitation is minimal through this branch. Moisture which is left by Bay of Bengal is stopped by Aravalli and making the western part of Rajasthan a desert.