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In the unlikely possibility that you're not following the Rota das Emoções trail, but you still want to visit the Parnaíba Delta, it's possible to organize it as a day trip from Barreirinhas. It leaves at around 07:30 from town, from where it's a 2-hr ride to Tutóia. The boat tour will visit mangroove areas, seahorse spotting areas, make a couple of stops on idylic fluvial islands for bathing and finally wait for the ibis birds to fly back to their favorite island at sunset.
Farol de Preguiças