Lagoa dos Patos
has an elongated shape that moves towards
the SW-NE, parallel to the riograndense
coast, from which is separated by a long
sandbank of about 240 Km.
In the south, Lagoa dos Patos communicates
with the sea between the towns of São
José do Norte and Rio Grande, through
Canal do Norte at the bar of Rio Grande,
where two rock piers were built to improve
the conditions to traverse the bar.
In the north, it has two ramifications -
at the northeast, Lagoa do Casamento and
at the northwest, Rio Guaíba, a passage
between Lagoa dos Patos and Jacuí
Delta, formed by Jacuí, Caí,
dos Sinos and Gravataí rivers.
Rio Taquari is the main tributary of Jacuí.
Lagoa dos Patos communicates with Lagoa
Mirim through São Gonçalo
Lagoa dos Patos area is around 9,800 Km²,
not including Guaíba.
It is 220 km long, has an average width
of 33 km, and its maximum width reaches
The access by sea to the port of Porto Alegre
is made through 72 km of channels dragged
in Lagoa dos Patos and in Rio Guaíba
for a 5.18 m (17 feet) draft, after the
passage of Rio Grande bar.