Siwan is a town and parish of Nagar in the Indian state of Bihar. It is the administrative headquarters of Siwan District and one of the three urban settlements in the district. It is near Uttar Pradesh.

The city of Siwan is located at the coordinates 26.22°N 84.36°E Latitude and Longitude. It is located in one of the Tarai regions of the Himalayas. It has an average height of 72 meters (236 feet). The Daha River, a small river that overflows in the rainy season, runs through the west of the city. In summer the river begins to dry up. The green area in Siwan covers approximately (21%) of the area.

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