Marajo is an inhabited island, located at the mouth of the Amazon River in Brazil. With a land area of 40,100 km˛ (15,500 sq mi, see list of islands by size), it is the largest island to be completely surrounded by fresh water. The city of Belém lies to the south, across the southern fork of the river's mouth.
In the 1918–1919 outbreak of the Spanish influenza, Marajo is the only major populated area to not have documented any cases of the illness.
Location: Ilha Marajo in the Mouth of the Amazon is the size of Switzerland.
Mark has always wanted to visit the huge island of Marajo, an island the size of Switzerland and the largest island in the Amazon river mouth where the opposite banks are 200 miles apart or the distance from London to Paris.
De Schauensee's anaconda is confined to Ilha de Marajo, Para; Amapa and French Guiana.