Birpur is a town located in the Supaul district of northeastern Bihar, near the India–Nepal border. It is well known for the Bhimnagar (Koshi) Barrage, an important hydraulic structure built across the Koshi River. The barrage plays a crucial role in flood control, irrigation, and power generation in the region. Birpur serves as a gateway point for cross-border movement and trade with Nepal. Agriculture is a major livelihood in surrounding areas, supported by fertile river plains. The town has road connectivity linking it to Supaul and other parts of Bihar. Local markets and services support residents as well as visitors to the barrage. Birpur continues to hold strategic and economic importance in the Koshi region.