São Mateus River References São Mateus River river, Brazil Ask Anything Homework Help Written by The Information Architects of Encyclopaedia Britannica The Information Architects maintain a master list of the topics included in the corpus of Encyclopædia Britannica, and create and manage the relationships between them. The Information Architects of Encyclopaedia Britannica Britannica AI Ask Anything Learn about this topic in these articles: Espírito SantoThe most important rivers—the Doce, São Mateus, and Itapemirim—flow eastward across the state to the ocean; navigation on these rivers is hampered by their irregular rate of flow, as well as by falls, rapids, and sandbars. Read MoreThe most important rivers—the Doce, São Mateus, and Itapemirim—flow eastward across the state to the ocean; navigation on these rivers is hampered by their irregular rate of flow, as well as by falls, rapids, and sandbars. Read More