March 08, 2015

Physical regions and rivers of Andhra Pradesh, Andhra Pradesh Rivers and Regions


Basing on Physical, Social and economic conditions, Andhra Pradesh can be divided into three Physical regions. They are
  1. Coastal Plains
  2. Eastern Ghats
  3. Western Plateau
Physical Regions
  • Coastal Plains
    • Coastal plain stretches from the eastern ghats to the Bay of Bengal. To a large extent this plain was formed with alluvium brought by rivers. It extends over a length of about 972 kilometers from Mahendragiri in the North to the Pulicot lake in the South. This plain is narrow in the North and South, but at the central part it bulges out to a width of about 160 kms, because of the formation of the deltas by Krishna and Godavari rivers. Deltas are very fertile as they are formed with rich alluvium.
    • There is a depression called Kolleru lake between the two deltas of Krishna and Godavari rivers. This is a fresh water lake. Its area is 250 square kilometers.
    • In between Nellore district and the State of Tamilnadu, sea water penetrated into this coastal plain and formed Pulicot lake. It extends over an area of 460 square kilometers, of which major portion is in Andhra Pradesh. This is a salt water lake. It is largest lake in Andhra Pradesh.
  • Eastern Ghats
    • Eastern Ghats exist in between coastal plain and western plateau. Eastern Ghats are a series of hills with broken hills locally. They extend over a length of about 70 Kms, in the North with a height of 1200 meters at many places. These hills are composed of Charnockites and Khondalite rocks. Araku valley in Visakhapatnam district and Papikondalu in East and West Godavari districts are important hills here.
    • The Eastern Ghats are less massive to the south of the Krishna river and they occur in two ridges. The outer ridge is composed of the Nallamala and Velikonda ranges, and inner ridge is composed of Erramala, Seshachalam and Palakonda ranges. The heights of these hill varies from 700 meters to 1105 meters. Seshachalam hills are otherwise known as Tirupathi hills. Mahendragiri is the highest peak in the Eastern Gahts.
  • Western Plateau
    • It is an ancient plateau made of rocks of Archean origin. Telangana State and Ananthapur and Kurnool districts of Rayalaseema region of Andhra Pradesh are in this plateau. The height of the plateau ranges from 150 meters to 750 meters. There are Gondwana rocks in Godavari basin in the northern part of the plateau. Coal is found in the Gondwana rocks.

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