The Gandak is a tributary of the Ganges river. It starts in the Himalayas in Nepal where it is known as the Narayani. It then flows through India in Bihar, eventualy merging with the Ganges near Patna. Early morning on the Ganges The River Ganges (Ganga in Indian languages) (Devanagiri गंगा) is a major river in northern India. ... The Himalaya is a mountain range in Asia, separating the Indian subcontinent from the Tibetan Plateau. ... Narayani Zone of Nepal borders India on the south. ... Bihar (बिहार in Devanagri) is a state situated in the eastern part of India. ... Patna (पटना)is the capital of the Indian state of Bihar, and one of the oldest continuously inhabited places in the world. ...