Valmiki National Park is a tiger reserve in the West Champaran District of Bihar, India. It is the only national park in Bihar. Valmiki Tiger Reserve covers 898.45 km2 (346.89 sq mi), which is 17.4% of the total geographical area of the district. As of 2022, there were 54 tigers in the Reserve.

West Champaran is an administrative district in the state of Bihar in India, located just 60 km (37 mi) west of Birgunj. It is the largest district in Bihar with an area of 5,228 km2(2,019sq mi). It is a part of Tirhut Division. The district headquarters are located in Bettiah. The district is known for its open border with Nepal. One of the major location in West Champaran is Kumar Bagh for SAIL Special Processing Unit and Bhitiharwa where Mahatma Gandhi started Satyagrah Aandolan.