Geography of Bihar
Overview
Geography of Bihar is a high-yield topic for Bihar TET Paper II Social Studies. Questions frequently test candidates on the state's physical features, river systems, climate patterns, agricultural output, and mineral resources. Since Bihar TET is a state-level examination, expect 3–5 questions directly from this topic, often combining factual recall with map-based understanding.
Bihar lies in the eastern part of India, bounded by Nepal to the north, West Bengal to the east, Jharkhand to the south, and Uttar Pradesh to the west. The state's geography is dominated by the fertile Gangetic Plain, making it one of India's most agriculturally productive regions. Understanding Bihar's geography helps teachers contextualize EVS and Social Studies content for students who experience this landscape daily.
Mastery requires knowing the major rivers, soil types, climatic divisions, principal crops, and the limited but important mineral deposits. Pay special attention to district-specific facts and the contrast between north Bihar (flood-prone) and south Bihar (plateau fringe).
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Key Concepts
- **Location and Boundaries**: Bihar extends from 24°20'N to 27°31'N latitude and 83°19'E to 88°17'E longitude. Total area is approximately 94,163 sq km, making it the 12th largest state by area.
- **Physiographic Divisions**: Bihar has three natural divisions — (1) the Himalayan foothills (Terai-Bhabar) in the extreme north, (2) the North Gangetic Plain between the Himalayan foothills and the Ganga, and (3) the South Gangetic Plain between the Ganga and the Chota Nagpur Plateau fringe.
- **Drainage System**: The Ganga is the master river, flowing west to east. North Bihar rivers (Gandak, Kosi, Bagmati, Burhi Gandak, Mahananda) originate in Nepal and cause frequent floods. South Bihar rivers (Son, Punpun, Phalgu) originate from the Chota Nagpur Plateau and are relatively stable.
- **Monsoon-Dominated Climate**: Bihar experiences a subtropical monsoon climate with three seasons — summer (March–May), monsoon/rainy (June–September), and winter (October–February). About 85% of annual rainfall occurs during the monsoon.
- **Alluvial Soil Dominance**: Most of Bihar is covered by new alluvium (Khadar) near river channels and old alluvium (Bhangar) on higher terraces. This makes the land extremely fertile for agriculture.
- **Agriculture as Economic Base**: Over 75% of the population depends on agriculture. Rice and wheat are the staple crops. Bihar is a leading producer of litchi, makhana (fox nuts), and vegetables.
- **Limited Mineral Resources**: After the bifurcation creating Jharkhand (2000), Bihar lost most mineral wealth. Remaining resources include limestone (Rohtas), pyrite (Rohtas), and silica sand.