A few different roman amphorae related with the ancient town of Balsa (actual Torre d'Aires, on the outskirts of the city of Tavira).
The first one (first and second photos) is a baetica (Andalusian) amphora from the I Century CE. This recipient was used to transport garum (a fermented fish sauce whose production was one of the most important economic activities of Balsa; the garum balsenses was exported to the entire western Roman Empire, where it was widely appreciated).
The second amphora (first and third photos) was manufactured in the south of the roman province of Lusitania (Portugal) in the IV or V Century, and it was also used to transport fermented fish sauces.
The third roman amphora (fourth photo) is from the I Century BC, and it was produced in the Italian Peninsula. This ceramic piece was rescued from a shipwreck on the Barrel Beach, not far away from the ancient town of Balsa. Unlike the other two, this amphora was used to transport wine.