The harbour had two large basins, now almost choked with sand.
The basins of the Parana and Paraguay are separated by low mountain ranges extending north from the sierras of Paraguay.
These saline basins extend down to the lower terraces of Cordoba, Mendoza and La Pampa.
The rivers of the province belong to the basins of the Indian Ocean and the Java Sea respectively, the water-parting being formed by the western and eastern ends respectively of the northern and southern lines of mountain peaks.
The dockyard, chiefly used for naval repairs, covers about 60 acres, and consists of three basins and large docks, the depth of water in the basins ranging down to 26 ft.