Vasai or Bassein Fort, Thane, Maharashtra India

Vasai or Bassein Fort is a large fort in Vasai village, in the Vasai taluka (county) of the District of Thane, Konkan Division, Maharashtra State, Republic of India. The name "Bassein" is the English version of the Portuguese "Baçaim" (with the "ç" spoken as "s" and with the "m" silent), itself a version of an apparently native name that may have a connection to the Vasa Konkani tribals of the North Konkan region, extending from Mumbai into "South Gujarat." The Marathi name of the place is Vasai.

The complete form of the Portuguese name is "Fortaleza de São Sebastião de Baçaim" or the Fort of St. Sebastian of Vasai. The Vasai fort is a monument of national importance and is protected by the Archaeological Survey of India.

The fort and the village are accessible most easily through the Vasai Road Railway Station, which itself is in Manikpur-Navghar, a part of the newly raised City of Vasai-Virar (See "Vasai-Virar Municipal Corporation"), and lies to the immediate north of the cities of Mumbai and Mira Road-Bhayander. The "Vasai Road" Railway Station is on the Western Railway line (formerly the Bombay, Baroda & Central India Railways) in the direction of Virar Railway Station.

Despite the fort is so old and in the condition of ageing, there are many remains, which are still livens the wonderful architecture of the olden days. Three chapels inside the fort are in the condition, which can be easily recognized. They have facades typical of 17th century Portuguese churches. The southernmost of these has a well-preserved barrel vaulted ceiling. Many of the watchtowers still stand so strong, with secure staircases.

Bassein was ruled over by many rulers such as the Portuguese, the Marathas and finally the British and in the course of time Bassein became a flourishing shipbuilding centre and the famous Bassein stone was very much in demand.