Geography of Bihar: Rivers, Districts and Borders
Overview
Bihar is a landlocked state in eastern India bordered by Uttar Pradesh (west), Jharkhand (south), West Bengal (east), and Nepal (north). It has 38 districts spread across two main plains divided by the Ganga river. The state is drained by major river systems originating from the Himalayas and the Chota Nagpur Plateau, making it one of India's most river-rich states. Understanding Bihar's rivers, district boundaries, and interstate borders is essential for UPSC and BPSC prelims and mains.
Typed Notes
Bihar's Borders and Geographical Position
Bihar is situated between 24°20'10" N to 27°31'15" N latitude and 83°19'50" E to 88°17'40" E longitude. It borders Uttar Pradesh to the west, Nepal to the north, West Bengal to the east, and Jharkhand to the south. Jharkhand was carved out of Bihar on 15 November 2000. The total boundary length with Nepal is approximately 601 km. Bihar is entirely landlocked with no coastline. Patna, the capital, lies on the southern bank of the Ganga. The state's east-west length is about 483 km and north-south width is about 345 km.
River Systems of North Bihar (Himalayan Rivers)
North Bihar is drained by rivers originating from the Himalayas and Nepal. The Gandak (Narayani) enters Bihar at Tribeniganj and meets the Ganga at Hajipur. The Kosi, called 'Sorrow of Bihar' due to frequent floods and course changes, meets the Ganga near Kursela in Katihar district. The Bagmati originates from Kathmandu Valley and meets the Ganga near Khagaria. The Kamla-Balan and Adhwara group of rivers drain Madhubani and Darbhanga. The Mahananda, easternmost river, drains Kishanganj and meets the Ganga in West Bengal. The Burhi Gandak flows parallel to Gandak and meets the Ganga at Munger.
River Systems of South Bihar and the Ganga
The Ganga enters Bihar from Buxar district and exits near Rajmahal (Jharkhand border) after flowing approximately 445 km through the state. South Bihar rivers originate from the Chota Nagpur Plateau and Vindhya-Kaimur ranges. The Son river, the largest south-bank tributary, originates from Amarkantak (MP) and meets the Ganga near Patna (Arrah-Koilwar area). The Punpun river meets the Ganga south of Patna. The Falgu (sacred river) flows through Gaya — it is a seasonal river where Pitru Paksha rituals are performed. The Sone canal system is Bihar's most important irrigation network.
Districts, Divisions and Administrative Geography
Bihar has 38 districts organised into 9 administrative divisions: Patna, Magadh, Nalanda, Munger, Bhagalpur, Purnia, Kosi, Tirhut, and Saran. The largest district by area is Pashchim Champaran (West Champaran) at about 5,228 sq km. The smallest district by area is Sheikhpura. Kishanganj is the easternmost district bordering West Bengal and Bangladesh (indirectly via West Bengal). Buxar is historically significant as the site of the Battle of Buxar (1764). Vaishali district contains the ancient Licchavi republic capital. Nalanda district houses the ruins of the ancient Nalanda University (UNESCO World Heritage Site since 2016).
Key Concepts
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- 01Bihar shares its northern border with Nepal (open border) across districts like Sitamarhi, Madhubani, Supaul, Araria, and Kishanganj.
- 02The Ganga river divides Bihar into North Bihar Plain (Himalayan rivers) and South Bihar Plain (Peninsular rivers).
- 03Bihar has 38 districts, 9 divisions, and covers an area of 94,163 sq km — 13th largest state by area in India.
- 04The Gandak, Kosi (Sorrow of Bihar), Bagmati, Kamla-Balan, and Mahananda are major North Bihar rivers originating from Nepal/Himalayas.
- 05Son, Punpun, Falgu, and Sone are major South Bihar rivers originating from the Chota Nagpur Plateau/Vindhya range.
Questions & Solutions
Pehle khud try karo — phir solution kholo. Yahi tariqa topper banata hai.
Why is the Kosi river called the 'Sorrow of Bihar'? Where does it meet the Ganga?
Which district of Bihar is the largest by area and which is the smallest? Name the division each belongs to.
Name the five districts of Bihar that share a border with Nepal and identify the river associated with each.
The Son river is the largest south-bank tributary of the Ganga in Bihar. Trace its origin and describe its significance.
On which date was Jharkhand carved out of Bihar, and what was the immediate geographical impact on Bihar?
Bihar's geography is defined by the Ganga dividing it into Himalayan-fed north and plateau-fed south river plains. The state has 38 districts across 9 divisions, borders Nepal (north), UP (west), West Bengal (east), and Jharkhand (south). Key rivers include Kosi, Gandak, Son, and Ganga. Jharkhand separated from Bihar in 2000. Pashchim Champaran is the largest district. These facts recur consistently in BPSC and UPSC state-level questions.
Chapter-end quiz
4 MCQsOption tap karo — turant pata chalega sahi ya galat, explanation ke saath.
Q1.The Gandak river meets the Ganga at which town in Bihar?
Q2.Which UNESCO World Heritage Site related to ancient university ruins is located in Bihar?
Q3.Bihar shares its western border with which state?
Q4.Which river is associated with the Pitru Paksha (Pitrupaksh Mela) rituals held at Gaya in Bihar?
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