The 8.0 Mw  Nepal–Bihar earthquake strikes Nepal and Bihar with a maximum Mercalli intensity of XI (Extreme), killing an estimated 6,000–10,700 people.

The 1934 Nepal–India earthquake or 1934 Bihar–Nepal earthquake was one of the worst earthquakes in India's history. The towns of Munger and Muzaffarpur were completely destroyed. This 8.0 magnitude earthquake occurred on 15 January 1934 at around 2:13 pm IST and caused widespread damage in northern Bihar and in Nepal.

Nepal, officially the Federal Democratic Republic of Nepal, is a landlocked country in South Asia. It is mainly situated in the Himalayas, but also includes parts of the Indo-Gangetic Plain. It borders the Tibet Autonomous Region of China to the north, and India to the south, east, and west, while it is narrowly separated from Bangladesh by the Siliguri Corridor, and from Bhutan by the Indian state of Sikkim. Nepal has a diverse geography, including fertile plains, subalpine forested hills, and eight of the world's ten tallest mountains, including Mount Everest, the highest point on Earth. Kathmandu is the nation's capital and its largest city. Nepal is a multi-ethnic, multi-lingual, multi-religious, and multi-cultural state, with Nepali as the official language.

Bihar also spelled Behar in colonial documents, is a state in Eastern India. It is the second largest state by population, the 12th largest by area, and the 14th largest by GDP in 2024. 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, a large chunk of southern Bihar was ceded to form the new state of Jharkhand. Around 11.27% of Bihar's population live 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.