evidence: Maritime threats the International Maritime Bureau reports the territorial waters of Brazil are a risk for armed robbery against ships; in 2021, three attacks against commercial vessels were reported, a decrease from the seven attacks in 2020; all of these occurred in the port of Macapa while ships were berthed or at anchor [...] Brazil-Bolivia: The Roboré Accord of March 29, 1958 placed the long-disputed Isla Suárez/Ilha de Guajará-Mirim, a fluvial island on the Río Mamoré, between the two towns of Guajará-Mirim (Brazil) and Guayaramerin (Bolivia), under Bolivian administration but did not resolve the sovereignty dispute [...] Brazil-Uruguay: The uncontested boundary dispute between Brazil and Uruguay over over Arroyo de la Invernada triangle and sovereignty over Isla Brasilera leaves the tripoint with Argentina in question. Smuggling of firearms and narcotics continues to be an issue along the Uruguay-Brazil border.