Qualla: Isla Suarez

Isla Suarez: Introduction

Fri, 06 Mar 2026 00:00:00 GMT

Photo credit DrRandomFactor, CC BY-SA 3.0. Two countries claim this island and neither seems to want it badly enough to fight. Isla Suarez -- or Ilha de Guajara-Mirim, depending on which side of the Mamore River you ask -- has been the subject of diplomatic notes, treaties, and studied inaction since 1867. The island sits in the wide, brown current of the Mamore, which forms the border between Bolivia's Beni department and Brazil's Rondonia state, and its sovereignty remains unresolved in a way that says more about the nature of borders in the Amazon than any map could.

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Image: DrRandomFactor | CC BY-SA 3.0

Isla Suarez: A Line Drawn on Water

Fri, 06 Mar 2026 00:00:00 GMT

Photo credit Photograph: NASA, Public domain. The trouble began with the Treaty of Ayacucho, signed on March 27, 1867, which attempted to draw a line between Brazil and Bolivia through some of the most remote terrain on the continent. Article 2 of the treaty sent the border down the Verde River to the Guapore and along the M...

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Image: Photograph: NASA | Public domain

Isla Suarez: Complaints, Reports, and Studied Inaction

Fri, 06 Mar 2026 00:00:00 GMT

Photo credit Photograph: NASA, Public domain. The diplomatic file on Isla Suarez reads like a slow-motion negotiation between two parties who would rather not negotiate at all. In 1930, the Brazilian legation in La Paz lodged a formal complaint about what it considered Bolivia's inadequate occupation of the island. Bolivia r...

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Image: Photograph: NASA | Public domain

Isla Suarez: The Island Between

Fri, 06 Mar 2026 00:00:00 GMT

Photo credit Photograph: NASA, Public domain. On the ground -- or rather, on the water -- the situation is simpler than the diplomats have made it. Brazilian inhabitants of the nearby city of Guajara-Mirim use the island for economic activity and hold most of its territory in practical terms. Bolivia administers it de jure. ...

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Image: Photograph: NASA | Public domain

Isla Suarez: Sovereignty as Suggestion

Fri, 06 Mar 2026 00:00:00 GMT

Photo credit Photograph: NASA, Public domain. What makes Isla Suarez compelling is not the island itself but what it reveals about the nature of sovereignty in places where the state is thin. In the capitals of Brasilia and La Paz, borders are lines on official maps, subjects of treaties and ratifications. In the western Ama...

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Image: Photograph: NASA | Public domain