बिहार के सारण और वैशाली जिले की सीमा पर अवस्थित सोनपुर में गंडक के तट पर बाबा हरिहर नाथ का मंदिर स्थापित है।

यह राजधानी पटना से 25 किलोमीटर और वैशाली के हाजीपुर शहर से 3 किलोमीटर दूर है।

RoadWays:

Sonpur is nearly 3 Km from Hajipur and 25 km from Patna and 58 km from Muzaffarpur in Bihar & 60 km from Chhapra, the headquarter of Saran District. Buses, Taxis and Auto-rickshaws are easily available.

Railways

Sonpur station The Nearest Railway Station is Sonpur Junction railway station. It has the 8th Largest Railway Platform in the World. It has trains connecting almost every part of India. It is the divisional headquarters of the East Central Railway of the Indian Railways.

Waterways

Bihar Government organizes ferries to Sonpur during the Season of Sonepur Cattle Fair from Patna.