The Sone River forms a boundary between Bihar and Uttar Pradesh for a considerable portion of its course before joining the Ganges.

Emperor Ashoka, after witnessing the bloodshed in the Kalinga War, embraced Buddhism and made it his mission to spread the religion across Asia through missionaries and edicts inscribed on pillars and rocks.

The Mauryan Empire was established by Chandragupta Maurya in 322 BCE, making it the 4th century BCE. This marked the beginning of one of India's greatest empires with Pataliputra as its capital.

The Ashoka Pillar at Pataliputra contains the Pillar Edict I, which emphasizes moral and ethical governance. Multiple Ashoka Pillars exist in Bihar, each containing different edicts related to his administration and Buddhist philosophy.

Bihar's present boundaries were formed in 2000 when Jharkhand was separated from Bihar. Before 2000, Bihar included the present-day Jharkhand region as well.

The Rajendra Setu, also known as the Second Hooghly Bridge, connects Bihar (specifically Katihar region) across the Mahananda River. Major bridges like the Ganges bridges connect Bihar with Uttar Pradesh across the Ganges River.

The Tripitaka (Three Baskets), the foundational Buddhist scriptures comprising Vinaya, Sutra, and Abhidharma, were studied, preserved, and copied at Nalanda University, making it the center of Buddhist learning.

Pataliputra was the capital of the Mauryan Empire and was associated with all major Mauryan emperors including Chandragupta Maurya, Bindusara, and Ashoka.

The Kosi River originates from the Himalayas in Nepal and is known for causing devastating floods in Bihar. It is called 'Sorrow of Bihar' due to its destructive nature.

Bihar has several wildlife sanctuaries including Valmiki National Park in West Champaran, Rajgir Wildlife Sanctuary in Nalanda, and Bhimbandh Wildlife Sanctuary in Munger.