Isla Suárez/Ilha de Guajará-mirim is a territory of Brazil
The Ilha de Guajará-Mirim (Brazil) or Isla Suárez (Bolivia) is one of the world's many disputed territories. The island lies in the Rio Mamoré in Amazon, which defines part of the boundary between the Bolivian department of Beni and the Brazilian state of Rondônia in the Amazon. The island's sovereignty is the object of passive contention between the governments of Brazil and Bolivia, which administer it de jure. [...] The Government of Brazil agreed with the Government of Bolivia to re-examine the issue of the legal status of the island of Guajará Mirim (Isla Suárez).[2] In 2009, the island continues without a definitive solution regarding its territorial possession, and it remains supposedly under Bolivian administration, despite the fact that the island is a place of economic activity for the Brazilian inhabitants of Guajará-Mirim, who hold most of the island's territory. More than 80 islands in the Guaporé and Mamoré rivers have yet to be assigned to one country or another.