Sonargaon was a historic administrative, commercial and maritime centre in Bengal. Situated in the centre of the Ganges delta, it was the seat of the medieval Muslim rulers and governors of eastern Bengal. Sonargaon was described by numerous historic travellers, including Ibn Battuta, Ma Huan, Niccolò de' Conti and Ralph Fitch as a thriving centre of trade and commerce.
It was an administrative centre of Fakhruddin Mubarak Shah's sultanate, the Bengal Sultanate and the Kingdom of Bhati.
The area is located near the modern industrial river port of Narayanganj in Bangladesh. Today, the name Sonargaon survives as the Sonargaon Upazila (Sonargaon Subregion) in the region. Source: https://en.wikipedia.org/wiki/Sonargaon