Argentina’s main characteristic is the enormous contrast between the immense eastern plains and the impressive Andes mountain range to the west. From Jujuy to Tierra del Fuego, the Andes presents marvellous contrasts: the Northwest plateaus, the lake region, the forests and glaciers in the Patagonia. To the north, Chaco is a forested area linked to rivers Bermejo, Salado and Pilcomayo. Between the Paraná and Uruguay rivers, the Argentine Mesopotamia (provinces of Entre Ríos, Corrientes and Misiones) is formed by low hills, where pools and marshlands evidence the ancient courses of these great rivers. In some places within the subtropical rain forest, there are fissures which provide such spectacular phenomena as the Iguazú Falls. The Pampas, in the centre of Argentina, is the largest and best-known area of plains. Agricultural and livestock activities are performed in this area, which includes the province of Buenos Aires, the northeast of La Pampa, the south of Córdoba and south of Santa Fe. To the south, the plains give way to small hills in Tandil and de la Ventana, and to the west, to the Córdoba hills. Towards the south, from the Andes to the sea, there appear the sterile and stony plateaus of Patagonia, swept by the wind during most of the year. The Atlantic coast, lined with high cliffs, forms massive indentations like the Peninsula Valdes, with its spectacular and unique colonies of sea animals.
The City of Buenos Aires is the capital of the Argentine Republic and is located in the southern hemisphere, latitude 34º 36 and longitude 58º 26. The city extends on a plain and has 202 square kilometres. Approximately 3 million people live in this city. Including the metropolitan area, the total population of Buenos Aires is above ten millions, making it one of the 10 most populated urban centres in the world. The Río de la Plata and the Riachuelo are the natural borders of the city on the east and south, respectively. The rest of the metropolitan perimeter is surrounded by the General Paz Avenue from north to west. This avenue provides a fast connection between the city and the Greater Buenos Aires, a densely populated area with important business and industrial activity.