brasil's longest border is with the country of bolivia, but the countries are connected on more fronts than geographic landmarks - The two governments also unite around initiatives related to energy consumption and production, Amazonian conservation, and fostering bolivia's involvement in the MERCOSUR, mercado comum do sul (common market of the south).

Brazil has been involved in many projects to stimulate the bolivian economy such as purchasing bolivian natural gas since the 1980s and since 2003 bolivia has had yearly trade surplus greatly due to the export of gas - Brazil has traditionally been bolivia's most involved trading partner and brasil's presence has played a strong economic role in boosting the economy of Bolivia.