Bihar is a state in Eastern India. It is the third largest state by population, the 12th largest by area, and the 14th largest by GDP in 2021. Bihar borders Uttar Pradesh to its west, Nepal to the north, the northern part of West Bengal to the east, and Jharkhand to the south. Bihar is split by the river Ganges, which flows from west to east. On 15 November 2000, southern Bihar was ceded to form the new state of Jharkhand. Only 11.27% of the population of Bihar lives in urban areas as per a 2020 report. Additionally, almost 58% of Biharis are below the age of 25, giving Bihar the highest proportion of young people of any Indian state. The official language is Hindi, which shares official status alongside that of Urdu. The main native languages are Maithili, Magahi and Bhojpuri. But there are several other languages being spoken at smaller levels.

Uttar Pradesh is a state in northern India. With over 241 million inhabitants, it is the most populated state in India as well as the most populous country subdivision in the world – more populous than all but four other countries outside of India – and accounting for 16.5 per cent of the population of India or around 3 per cent of the total world population. The state is bordered by Rajasthan to the west, Haryana, Himachal Pradesh and Delhi to the northwest, Uttarakhand and Nepal to the north, Bihar to the east, Madhya Pradesh, Chhattisgarh and Jharkhand to the south. It is the fourth-largest Indian state by area covering 243,286 km2 (93,933 sq mi), equal to 7.3 per cent of the total area of India. Lucknow serves as the state capital, with Prayagraj being the judicial capital. It is divided into 18 divisions and 75 districts. On 9 November 2000, a new state, Uttaranchal, was created from Uttar Pradesh's western Himalayan hill region. The two major rivers of the state, the Ganges and its tributary Yamuna, meet at the Triveni Sangam in Prayagraj, a Hindu pilgrimage site. Other notable rivers are Gomti and Saryu. The forest cover in the state is 6.1 per cent of the state's geographical area. The cultivable area is 82 per cent of the total geographical area, and the net area sown is 68.5 per cent of the cultivable area.