President Costa e Silva Bridge, commonly known as the Rio-Niteroi Bridge, is a box girder bridge located at Guanabara Bay, in the State of Rio de Janeiro in Brazil. It connects the cities of Rio de Janeiro and the municipality of Niterói. It is currently the longest prestressed concrete bridge in the southern hemisphere, and the sixth longest in the world. It was originally named President Costa e Silva Bridge but rarely is it called that today.