Patna Sahib Gurdwara in Patna marks the birthplace of Guru Gobind Singh, the tenth and final Guru of Sikhism. It is one of the most important Sikh pilgrimage sites.

The Battle of Buxar (1764) was fought near Patna between the East India Company and a coalition of Mir Qasim (Nawab of Bengal), Shuja-ud-Daulah (Nawab of Awadh), and Mir Jafar (former Nawab). It established British dominance in northern India.

The Ganga Action Plan was launched in 1985 by the Indian government to clean the Ganga River. Bihar is significantly affected as the Ganga flows through the state, and several cities like Patna depend on it.

Mahatma Gandhi led the Champaran Satyagraha in 1917 against indigo planters in Champaran, Bihar. Though Gandhi was not from Bihar, this movement was conducted in Bihar and is a significant part of its freedom struggle history.

The Rajmahal Hills in Bihar are known for their scenic landscape along the Ganga River. However, the question might refer to the Rajgir hills (not Rajmahal), which are more important pilgrimages sites associated with Buddha.

Bihar has 40 Lok Sabha constituencies, making it one of the states with significant representation in the Indian Parliament after Uttar Pradesh and Maharashtra.

Bihar is one of India's major mica-producing states, with significant deposits in the southern plateau region.

The Kosi River flows through northern Bihar districts including Supaul, Araria, and Madhubani, frequently causing floods due to its unpredictable course.

Lord Mahavira attained moksha at Pawapuri in Bihar and spent much of his time in the Magadha and Anga regions of ancient Bihar.

Emperor Akbar strengthened Mughal control over Bihar and made it a prosperous province with better administration and tax systems.