ilha do tatu (tatu's island) is located very close to the southern edge of the sepetiba beach, and can be easily seen from the coast.

it is a rocky formation measuring half a kilometer in length and shaped like a vegetation-covered wall flanking the beach.

it is mirrored by the pescaria island and the adjacent cape, up north.

presenting a great variety of wildlife, the waters enveloping tatu island are well-known for the fishing activity, something that's part of the daily life in the sepetiba neighborhood and also across the homonymous bay.