Rajasthan is geographically divided into two partsRajasthan Plain and Udaipur Region. The Rajasthan plain includes the eastern portion of the Thar and the adjoining steppe land (Bagar) to the west of Aravalli.
The state lies between 23° 3’ and 30° 12’ north of latitude and 78° 17’ east oflongitude. The total area of Rajasthan is 3,42,274 Square Kilometres. Rajasthan is an irregular rhomb in its shape, its salient angles to the North, West, South and Eastbeing joined by the extreme outer boundary line of the erstwhile States of Banswara, Bikaner, Jaisalmer and Dholpur.
The topography of the Rajasthan is greatly influenced by the Aravalli, which divides the Rajasthan into two parts with different features, i.e. north - west and South-East of the Aravalli ranges. It covers the whole region by a dividing line from north-east and south-west. Thus, the Aravalli ranges clearly divide Rajasthan into two main divisions, i.e. north- west of the Aravalli and south-east of the Aravalli respectively.
So far as the Rivers and Lakes in Rajasthan are concerned, these are not large in number. In the north-west part of the Rajasthan the Luni River is very significant. This River emerges in Pushkar Valley near Ajmer and flows to Rann of Cutch,covering a distance of about 320 kilometers.