The Triple Frontier is a point where the borders of three countries – Paraguay, Argentina and Brazil – meet at the confluence of the Iguazú and Paraná rivers. Near this meeting of the rivers are the cities of Ciudad del Este in Paraguay), Puerto Iguazú in Argentina and Foz de Iguazú in Brazil. The Friendship Bridge joins Ciudad del Este and Foz de Iguazú, while the Tancredo Neves Bridge joins the cities of Foz de Iguazú and Puerto Iguazú. It is considered the main border of South America in terms of population, movement of people and international relations, and is recognised as one of the main tourist routes.
The Republic of Argentina and the Plurinational State of Bolivia share a 773-kilometre border that includes three border crossings including the Aguas Blancas-Bermejo International Border Crossing which connects both countries through National Route 50, joining the towns of Aguas Blancas in the Department of Orán, Salta, Argentina, and Bermejo in the Department of Tarija, Bolivia. The natural border is the Bermejo River. The transit of goods and people is intense in both directions.
The Desaguadero Border Crossing is the most important passage between Bolivia and Peru, through which about 90% of the trade between the two countries passes. It is a bi-national urban complex located at the source of the Desaguadero River between Bolivia and Peru. Both sides of the border are connected through two bridges that join the Bolivian and Peruvian towns of Desaguadero. The Bi-National Centre for Border Assistance is situated in Peruvian territory at the access point to the “New Bridge” with an infrastructure that ensures integrated control of both goods and migration.
The Republic of Colombia and Ecuador share a 730-kilometre border that includes four international crossings, with the Rumichaca International Bridge on the Guáitara River, the main transit point between the two countries. The Bridge joins the municipalities of Tulcán, (Cantonal Autonomous Government and capital of the Province of Carchi, Ecuador) and Ipiales, (Department of Nariños, Colombia), forming a bi-national conurbation. It is a natural bridge, originally used by the Inca emperor Huayna Capac for the movement of his troops. This is the main artery that joins these two nations in terms of both commerce and tourism.