The entry of Bahia do Santos is located between Pta Monduba (on Ilha de Santo Amaro) and Pta Itapu (on Praia Grande) At bottom of the bay is Ilha de Sao Vicente.
It is a wide bay and the shores of it consists of sandy beaches separated by small rocky points.
The E part of Ilha de Sao Vicente is separated from Ilha de Santo Amaro by a narrow buoyed channel which leads to Porto de Santos. There are general depths of 13 to 14.6m in the entrance to the bay and 7 to 10m in its N part.
Santos consists of the navigable estuary between Ilha de Santo Amaro and Ilha do Sao Vicente and forms a semi-circle around the city.
The port serves the nearby city of Sao Paulo and is the largest port in South America.
The approach channel, marked by buoys and ranges, is about 5 miles in length and is entered 2.25 miles SW of Ponta Grossa. The harbor channel is entered between Ponta da Praia to the N and Ponta de Fortaleza to the S.
Between Ponta de Itaipu, the W entrance of Baia de Santos, and the mouth of Rio Itanhaem, about 23 miles to the WSW, the coast is generally low.