Brings you the best marine ecotourism experiences in Europe
Located between the João de Arens beaches and the barra da Ria de AlvorGemeos Pequenos (the "smaller twins") is part of a collection of forty artificial reefs created by the Portuguese Institute for Sea and Atmosphere (IPIMAR) in 2000, placed in four rows at depths between 18m and 35m. They were meant to be used as a breeding and protection area for different local, marine species, and all along the reefs a gradual increase of biodiversity has been observed in the area. 

When diving in Gemeos Pequenos, the use of a torch is recommended, as it enables peeping into the holes in the rocks to see the fantastic colours of the various species of invertebrates and algae clinging to them. These formations make provide an ideal habitat for many juveniles and species that prefer to remain hidden, like congers. Small shoals of various other species are also common.

To maximize diving time, divers are advised to start the dive at the lower blocks and work their way up to the higher ones.

  • Level: Intermediate
  • Depth: 22m - 24m
  • Seabed: Sand (artificial reef)
  • Average water Temperature: Winter (14º-18º) Summer (18º-23º)
  • Visibility: Medium
  • Best season for diving: September & October
  • Closest hyperbaric chamber: 15' by boat