The
Baixa do Norte is located from
Ponta da Espalamaca, at a depth of approximately , to a depth reaching below sea level. The area is marked by two islets situated on the northwest coast of the island of Pico, in front of the seat of Madalena do Pico:
the Madalena Islets, also known as the Ilhéu em Pé and Ilhéu Deitado. These islets are the remains of a volcanic cone that has devolved following a submarine and substratus eruption. It is an area of refuge and nesting for marine birds, and encircled by a regular ocean depth of sand and cliff at a maximum of depth. At these depths there is a rich diversity of resident species, in addition to pelagic species, and spawning grounds of
grey triggerfish. ==References==