mentality was difficult to erase from Uruguay and political feuding continued culminating in the Revolution of the Lances (Revolución de las Lanzas) (1870–1872), and later with the uprising of Aparicio Saravia, who was fatally injured at the Battle of Masoller (1904). Recent years On 30 July 2010, President Luiz Inacio Lula da Silva of Brazil and Uruguays' José Mujica signed cooperation agreements on defence, science, technology, energy, river transportation and fishing with the hope of accelerating political and economic integration between these two neighbouring countries. In February 2021, The new President of Uruguay, Luis Lacalle Pou, made his first presidential trip overseas to meet with Brazilian President Jair Bolsonaro. On 1 March 2020, Bolsonaro had attended the inauguration ceremony of Luis Lacalle Pou in Uruguayan capital, Montevideo. Cross-border region The Brazil–Uruguay border extends . The close geographic proximity of some Brazilian and Uruguayan cities or urban centers have led them to be called "twin cities". These cities usually share close demographic, economic, and political bonds. The following are twin cities: Border disputes A longstanding border dispute involving territory in the vicinity of Masoller exists between Uruguay and Brazil, although this has not harmed close diplomatic and economic relations between the two countries. The disputed area is called Rincón de Artigas (Portuguese: Rincão de Artigas, Location -31.00, -55.95), and the dispute arises from the fact that the treaty that delimited the Brazil-Uruguay border in 1861 determined that the border in that area would be a creek called Arroyo de la Invernada (Portuguese: Arroio da Invernada), but the two countries disagree on which actual stream is the so-named one. Another disputed territory is Brazilian Island at the confluence of the Quaraí River and the Uruguay River. Trade and investment Resident diplomatic missions See also Brazilians in Uruguay Uruguayans in Brazil Foreign relations of Brazil Foreign relations of Uruguay Mercosur Union of South American Nations Cairns Group References External links Embassy of Brazil in Montevideo Official website Embassy of Uruguay in Brasília Official website Uruguay Bilateral relations of Uruguay Relations of colonizer and former colony