premise: Port of Spain is on an island.
hypothesis: Port Royal Island ( historically Port Royal ) is an island located in Beaufort County , South Carolina . The Port of Barcelona ( Port de Barcelona , [ ˈpɔr ðə βərsəˈɫonə ] ; Puerto de Barcelona ) has a 2000-year history and great contemporary commercial importance as one of Europe 's ports in the Mediterranean , as well as Catalonia 's largest port , tying with Tarragona . Port of Spain . It is located on the Gulf of Paria , on the northwest coast of the island of Trinidad and is part of a larger conurbation stretching from Chaguaramas in the west to Arima in the east with an estimated population of 600,000 . The city serves primarily as a retail and administrative centre and it has been the capital of the island since 1757 . The city is also home to the largest container port on the island and is one of several shipping hubs of the Caribbean , exporting both agricultural products and manufactured goods .