 Fifty miles south of Barcelore was Mangalore , the last of the Portuguese strongholds in Kanara , situated on the mouth of the Netravati River . There too the Portuguese built a fortress and alongside it a walled town with accommodation for 35 casados families . Both Barcelore and Mangalore became principal ports for the export of rice and during the first half of the 17th century and supplied the many strategic fortalezas that were of significance to the Estado da India , the Portuguese Asian empire . These included , Goa , Malacca , Muscat , Mozambique and Mombasa . ( See Map 1 . ) 
