Parnaiba Delta

The Parnaíba reaches the Atlantic through a great delta of channels, islands and sandbanks between Maranhão and Piauí. Its principal mouths include Tutóia, Caju, Canárias and Igaraçu, separated by islands and mangrove creeks. Scarlet ibises and herons feed among the delta's tidal waters, while sand gathers along its beaches and dunes.