The district of Saran is situated between 25°36' and 26°13' North latitude and 84°24' and 85°15' East longitude in the southern post of the newly created Saran Division of North Bihar. The Ganges constitute the Southern boundary of the district beyond which lie the districts of Bhojpur and Patna. To the north of Saran lie districts of Siwan and Gopalganj. The Gandak forms the dividing line with vaishali and Muzaffarpur district in the east. To the west of Saran lies district of Siwan and the district of Balia in Uttar Pradesh, the Ghaghra constituting a natural boundary between Saran and Ballia.
The district is shaped like a triangle with its apex at the confluence of boundary of Gopalganj district and Gandak-Ganga river there are three rivers namely the Ganga, Ghaghra, Gandak which encircle the district from south north east and western side respectively. The district is entirely constituted of plains but there are quite a few depressions and marshes, which cause the formation of three broad natural divisions.
I. The alluvial plains along the big rivers which are subjected to periodic inundation and prone to floods.
II. The region of uplands away from the rivers and not subject to floods.
III. The diara areas in the beds of the great rivers.
Out of twenty blocks in the districts, Six blocks viz Sonepur, Dighwara, Revelganj, Chapra, Manjhi and Dariyapur are affected by floods regularly. There are six partially flood affected blocks Viz. Garkha, Parsa, Marhoura, Amnaur, Jalalpur, and Ekma. The remaining blocks are free from floods. The soil of the district is alluvial. No mineral of economic value is found in the district.
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