Geography of Bihar — Study Notes
Overview
Geography of Bihar is a core topic in the Environmental Studies section of Bihar TET Paper I. Questions frequently test your knowledge of Bihar's location, major rivers, forest cover and climatic conditions. Since EVS at the primary level emphasises connecting children to their immediate environment, understanding the geographical setting of Bihar helps teachers design locally relevant lessons.
Bihar is one of the most densely populated states in India, situated in the eastern part of the country. Its geography is dominated by the fertile Gangetic plains, making it an agrarian state. The rivers—especially Ganga and its tributaries—shape the economy, culture and even the challenges (floods) faced by the people. Expect 2–4 direct questions from this sub-topic, often combined with rivers or climate data.
Mastering this topic requires remembering specific facts: coordinates, river names, district boundaries, forest percentage and monsoon patterns. Rote learning is unavoidable here, but linking facts to real-life contexts (why Kosi floods, why forests are sparse) makes retention easier.
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Key Concepts
- **Location and Boundaries**: Bihar lies in the middle Gangetic plain, bounded by Nepal (north), Jharkhand (south), West Bengal (east) and Uttar Pradesh (west). It has no international boundary other than Nepal.
- **Latitude and Longitude**: Bihar extends from 24°20'N to 27°31'N latitude and 83°19'E to 88°17'E longitude. The Tropic of Cancer does NOT pass through Bihar—it passes through Jharkhand to the south.
- **Physiographic Divisions**: The state has three broad regions—(i) the northern Himalayan foothills (Terai), (ii) the north Bihar plains (flood-prone), and (iii) the south Bihar plains (relatively elevated, less flooding).
- **River System**: Ganga is the master river, flowing west to east. North Bihar tributaries (Ghaghra, Gandak, Burhi Gandak, Bagmati, Kamla, Kosi) originate in Nepal/Himalayas and cause annual floods. South Bihar tributaries (Son, Punpun, Phalgu) originate in plateaus and are less flood-prone.
- **Kosi—The Sorrow of Bihar**: Kosi carries heavy silt from Nepal, frequently changes course and causes devastating floods in districts like Saharsa, Supaul and Madhepura.
- **Forest Cover**: Bihar has one of the lowest forest covers in India—about 7.7% of total area (against the national average of ~21%). Major forests are in the hilly southern districts like Kaimur, Rohtas and Gaya.
- **Climate**: Bihar has a humid subtropical climate with three distinct seasons—summer (March–May), monsoon (June–September) and winter (November–February). The southwest monsoon brings most of the annual rainfall.