Pedra da Âncora is possibly one of the most interesting scuba diving sites along the coastline of Portimao. Its name comes from an anchor of the Almirantado which is trapped in the rock formations to the Southwest. A place with lots of fauna, it can have quite strong currents, influenced by the Arade river, which sometimes can hinder visibility. The sandy bottom is around 20m, and in the North zone, the rocks can reach as high as 4m or 5m.
Conger eels can often be seen in the fissures in the rock, as well as crustaceans and scorpion fish among the lower rocks. The higher parts are normally frequented by gilthead bream, seabass and white seabream. The site is also alive with numerous gorgonians of various sizes and colours, which are well worth visiting many times, in order to fully explore them.