The Ghaghara River forms the northern boundary between Bihar and Uttar Pradesh.

Bihar's industrial backwardness is due to multiple factors: insufficient infrastructure (roads, railways, ports), limited skilled workforce, inadequate capital availability, and lower technological adoption. Solutions include attracting Foreign Direct Investment, establishing SEZs, improving transportation networks, and implementing skill development programs. The state has been working on these through various government initiatives.

Using compound growth formula: Final Population = Initial Population × (1 + growth rate)^time. P = 100 × (1 + 0.025)^3 = 100 × (1.025)^3 = 100 × 1.0769 = 107.69 million

The Kosi River's unpredictable behavior severely impacts Bihar's agriculture. Effective strategies include: (1) Strengthening and maintaining embankments, (2) Afforestation in upstream areas to control erosion, (3) Community-based early warning systems, (4) Developing flood-resistant crop varieties, (5) Crop insurance schemes. International cooperation with Nepal for upstream management is also crucial.

Madhubani district is renowned for its traditional Mithila paintings, a distinctive folk art form with origins in Hindu mythology and nature themes.

The separation of Jharkhand in 2000 had significant implications: Bihar lost major mineral-rich areas and industrial hubs, reducing its revenue base and industrial capacity. However, it allowed Bihar to focus on agriculture, education, and service sectors. This reorganization affected resource allocation, tax revenue, and development priorities, though long-term impacts include better governance in smaller, manageable entities.

Rice is the primary agricultural product of Bihar, with the state being a major rice producer in India due to favorable climate and fertile alluvial soil.

Santhals are a major scheduled tribe in Bihar, primarily concentrated in the Santhal Pargana region. They have a distinct culture, language, and traditions.

Nalanda University was one of the world's oldest universities, located in present-day Nalanda district. It was a major center of Buddhist learning until its decline in the 12th century.

AIIMS Patna was established in 2012 as part of the Government of India's initiative to expand quality medical education and healthcare in tier-II cities.