It is an extensive stronghold in Vasai town, in the Vasai taluka province of the District of Palghar, Konkan Division, Maharashtra State, Republic of India. The name "Bassein" is simply the English adaptation of the Portuguese "Bacaim" itself a form of an obviously local name that may have an association with the Vasa Konkani tribals of the North Konkan area, reaching out from Mumbai into "South Gujarat." The Marathi name of the place is Vasai. The total type of the Portuguese name is "Fortaleza de São Sebastiao de Baçaim" or the Fort of St. Sebastian of Vasai. The Vasai stronghold is a landmark of national significance and is ensured by the Archeological Survey of India.