It is clearly evident from the archaeological and literary sources that Sopara was the main entrepot dating from the pre-Asokan period up to the 3rd century A.D. and again from 9th to 13th century A.D. There is no evidence of cultural remains from 4th to 9th century and it seems that during this period Sopara had lost its importance. The main cause for the decline of the ancient port of Sopara was due to the effect of siltation caused by a rise in sea level. Further near-shore and off-shore marine archaeological exploration and excavation would be helpful to ascertain the extent of the ancient port city.