The port of Buenos Aires is one of the busiest in South America, as navigable rivers by way of the Rio de la Plata connect the port to northeastern Argentina, Brazil, Uruguay and Paraguay. As a result, it serves as the distribution hub for said vast area of the South American continent. The Port of Buenos Aires handles over  annually, and Dock Sud, just south of the city proper, handles another  . Tax collection related to the port has caused many political problems in the past, including a conflict in 2008 that led to protests and a strike in the agricultural sector after the government raised export tariffs.