Bihar Geography: Administrative Borders and Extreme Territorial Extents

1. Bihar Bordering Nepal (International)

Bihar shares a 726 km international border with Nepal to its North.

• Districts of Bihar touching Nepal (7):
  1. West Champaran
  2. East Champaran
  3. Sitamarhi
  4. Madhubani
  5. Supaul
  6. Araria
  7. Kishanganj
• Nepal Districts touching Bihar (8):
  • Saptari, Siraha, Dhanusa, Mahottari, Sarlahi, Rautahat, Bara, and Parsa.

2. Bihar Bordering Uttar Pradesh (West)

Bihar shares its western border with the state of Uttar Pradesh.

• Districts of Bihar touching Uttar Pradesh (8):
  1. West Champaran
  2. Gopalganj
  3. Siwan
  4. Saran
  5. Bhojpur
  6. Buxar
  7. Kaimur
  8. Rohtas (Note: Only a very small tip of Rohtas touches UP)
• Districts of Uttar Pradesh touching Bihar (7):
  1. Maharajganj
  2. Kushinagar
  3. Deoria
  4. Ballia
  5. Ghazipur
  6. Chandauli
  7. Sonbhadra

3. Bihar Bordering Jharkhand (South)

Bihar shares its southern border with Jharkhand. This is the longest state border for Bihar.

• Districts of Bihar touching Jharkhand (8):
  1. Rohtas
  2. Aurangabad
  3. Gaya
  4. Nawada
  5. Jamui
  6. Banka
  7. Bhagalpur
  8. Katihar
• Districts of Jharkhand touching Bihar (10):
  • Garhwa, Palamu, Chatra, Hazaribagh, Koderma, Giridih, Deoghar, Dumka, Godda, and Sahebganj.

4. Bihar Bordering West Bengal (East)

Bihar shares its eastern border with West Bengal.

• Districts of Bihar touching West Bengal (3):
  1. Kishanganj
  2. Purnia
  3. Katihar
• Districts of West Bengal touching Bihar (3):
  1. Darjeeling
  2. Uttar Dinajpur
  3. Malda

Summary Table for Quick Revision

Bihar: Latitudinal & Longitudinal Extent

🌐 Overall Geographical Extent

• Latitude: 24°20′ N to 27°31′ N
• Longitude: 83°19′ E to 88°17′ E

🧭 Four Extreme End Points of Bihar

🔺 Northernmost Point

• Latitude: ~ 27°31′ N
• District: West Champaran
• Near: Indo–Nepal border

🔻 Southernmost Point

• Latitude: ~ 24°20′ N
• District: Gaya / Aurangabad region
• Physiography: Part of Chotanagpur Plateau fringe

◀️ Westernmost Point

• Longitude: ~ 83°19′ E
• District: Kaimur
• Near: Bihar–Uttar Pradesh border

▶️ Easternmost Point

• Longitude: ~ 88°17′ E
• District: Kishanganj
• Near: West Bengal & Bangladesh