Ilhas Cagarras, about 3 miles N of Ilha Redonda, consists of seven islets. Ilha Comprida is the largest of the group. Ilha de Palmas shows a light.
Sunken rocks extend 183m S of the E end of Ilha de Palmas. Ilha do Pai and Ilha da Mae lie on the NE side of the approach to Baia de Guanabara, close W of Ponta de Itaipu. A shoal patch, with a depth of 20m, lies 0.2 mile S of Ilha do Pai.
Vessels approaching the entrance to Baia de Guanabara should keep a sharp lookout for small craft and fishing vessels.