praia de sepetibacan be seen on this satellite map - in the link as we publish it, zoom settings open correctly using chrome, but may not display the exact coordinates using other browsers.  

on this link, the institudo estadual do ambiente - inea, provides the suitability of several beaches in the sepetiba bay area, including praia de sepetiba.

constantly updated, a red flag means that swimming is not advisable, a green flag means waters are suitable fro swimming, and a yellow flag suggests using own judgment.