whose northern shore contains another country's capital, Montevideo; that body is the Rio de la Plata.
The oldest metro line in this country's capital was once known as the Anglo. The salt lake Mar Chiquita is the terminus of the Segundo River in the Cordoba province of this nation. The Ibera wetlands in this country lie within a region consisting of Misiones, Entre Ríos, and Corrientes, the Mesopotamia region. The Gulf of San Jorge contains its port city of Comodoro Rivadavia. San Martin island lies in this country's section of a natural landmark, as does the southern part of the Devil's Throat. This country's capital lies on the southwestern shore of a body of water whose northern shore contains another country's capital, Montevideo; that body is the Rio de la Plata. It shares Iguazú Falls with Paraguay and Brazil, and its northern grassland is called the Pampas. For ten points, name this South American nation with capital at Buenos Aires.
The oldest metro line in this country's capital was once known as the Anglo.
{Argentine} Republic [or República {Argentina}]