The Burhi Gandak River is a significant river in the state of Bihar, India. It is a tributary of the Gandak River and flows through several districts, including Vaishali and Samastipur. The river originates near the town of Bihar Sharif and eventually merges with the Gandak River, contributing to the region's irrigation and agriculture. The Burhi Gandak is known for its seasonal variations, with water levels rising during the monsoon. It supports local ecosystems and provides water for farming, which is vital for the livelihoods of many communities along its banks. The river also plays a role in the cultural and historical landscape of Bihar.