Besides the rivers mentioned, the chief streams are the Santa Lucia, which falls into the Plata a little west of Montevideo; the Queguay, in Paysandu; and the Cebollati, rising in the sierras in Minas and flowing into Lake Mirim.
It was also in accord with the desire of the Transvaal Boers to obtain a seaport, a desire which had led them as early as 1860 to treat with the Zulus for the possession of St Lucia Bay.
Of these St Lucia Lake and Kosi Lake are of considerable size and communicate with the sea by estuaries.
St Lucia, the larger of the two, is some 35 m.
The opening to the sea, St Lucia river, is at the south end.
