Tupinambarana
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Ilha Tupinambarana is a former fluvial island bordered by rivers of the
Amazon Amazon most often refers to: * Amazons, a tribe of female warriors in Greek mythology * Amazon rainforest, a rainforest covering most of the Amazon basin * Amazon River, in South America * Amazon (company), an American multinational technolog ...
system (Amazon, Madeira, Sucunduri, and Abacaxis) in eastern Amazonas,
Brazil Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area ...
. It has been split into four completely separate parts by natural
channels Channel, channels, channeling, etc., may refer to: Geography * Channel (geography), in physical geography, a landform consisting of the outline (banks) of the path of a narrow body of water. Australia * Channel Country, region of outback Austral ...
, just like those isolating it from the
mainland Mainland is defined as "relating to or forming the main part of a country or continent, not including the islands around it egardless of status under territorial jurisdiction by an entity" The term is often politically, economically and/or dem ...
. The original island stretched from the
municipalities A municipality is usually a single administrative division having corporate status and powers of self-government or jurisdiction as granted by national and regional laws to which it is subordinate. The term ''municipality'' may also mean the go ...
of
Parintins Parintins is a municipality in the far east of the Amazonas state of Brazil. It is part of a microregion also named Parintins. The population for the entire municipality was 115,363 ( IBGE 2020) and its area is 5,952 km2. The city is locate ...
, in the northeast, to Nova Olinda do Norte, in the southwest. The combined
area Area is the quantity that expresses the extent of a region on the plane or on a curved surface. The area of a plane region or ''plane area'' refers to the area of a shape or planar lamina, while '' surface area'' refers to the area of an ope ...
of the islands is to 11,850 kmĀ², making Ilha Tupinambarana the second largest fluvial group of islands in the world after
Bananal Island Bananal Island ( pt, Ilha do Bananal, ) is a large river island formed from the bisection of the Araguaia River, in southwestern Tocantins, Brazil. The island is formed by a fork in a very flat section of the Araguaia River. Bananal Island is t ...
. It is also the 92nd largest island in the world and the 3rd largest island in
Brazil Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area ...
. River islands of Brazil Islands of the Amazon Landforms of Amazonas (Brazilian state) {{Island-stub