Vasai, also called Bassein, lies about 48 kms north of Mumbai just across the Ulhas River. The fort in the old city was the headquarter of the Portuguese in the north, next in importance to Goa.
The coastal land-fort of Vasai was surrounded by sea on three sides and to the landside it had a moat which was filled by sea-water. Its 4.5kms long strong stone wall had 11 bastions. The fort had two gates – the westward land-gate. There was also a small citadel in the fort. Well – equipped with water-tanks, store-houses, armoury, etc., the fort also had fields for growing grains and vegetables.