The Ganga River Dolphin Sanctuary is located along National Waterway 1 in Bihar. National Waterway 1 is a 1,620-kilometer-long (1,007 mi) waterway that runs from Haldia in West Bengal to Varanasi in Uttar Pradesh. It is the longest national waterway in India. The waterway is part of the National Waterways Development Project, which aims to develop a network of inland waterways in India. The Ganga River Dolphin Sanctuary is a protected area that was established in 1991 to protect the endangered Ganges river dolphin. The sanctuary covers an area of 1,000 square kilometers (386 sq mi) and includes parts of the Ganges River, the Ghaghara River, and the Son River. The sanctuary is home to a population of about 2,000 Ganges river dolphins. The Ganges river dolphin is a freshwater dolphin that is found in the Ganges River and its tributaries. It is one of the most endangered dolphins in the world. The Ganges river dolphin is a shy and elusive animal. It is rarely seen by humans. The Ganges river dolphin is an important part of the river ecosystem. It helps to keep the river clean by eating fish and other aquatic animals. The Ganges river dolphin is also a popular tourist attraction.