Marajo, Or Joannes, an island of Brazil, in the mouth of the Amazon, which it divides into two unequal branches; length about 180 in., greatest breadth about 150 m.; pop. about 20,000, almost exclusively Indians. The land, is generally low and flat, and is watered by several navigable rivers and a number of small streams; the principal of the former are the Moudin, with a course of about 50 m., and the Arajaz, of 60 m. The climate is similar to that of the province of Grao Para. The soil, though marshy, favors the cultivation of most of the tropical products, especially rice, which is grown in prodigious quantities; but the principal occupation of the people is the rearing of cattle, which find excellent pasture in the vast prairies of the island. - Marajo was first given to Antonio de Souza de Macedo, baron Joannes, and was long known by his name. The Tupinamba Indians, who inhabited it. were civilized by the Jesuit priest Antonio Vieira; they were celebrated canoe builders and coasters. The island was united to the province of Grlio Para about 1830.