The northeastern Brazilian terrain gradually changes from brown, semi-arid land to the lush green of the Amazon rainforest. A light cloud-cover hugs the coast.
Offshore, an algal bloom and some sediments can be seen draining out into the ocean. Inland, two main rivers are identifiable: the São Francisco River (south) and the Parnaíba River (northwest).
Much of northern Brazil is characterized by an equatorial climate. There is no real dry season but there are some variations in the period of the year when most rain falls. Temperatures average 25 °C (77 °F).
In the interior Northeast, seasonal rainfall is even more extreme. The semiarid climate region generally receives less than 800 millimetres (31 in) of rain, most of which falls in a period of three to five months and occasionally even more insufficiently, creating long periods of drought.