the slab on the side of ilha cotunduba is called baixa cotunduba, 4 meters high and 340 long.

ilha cotunduba is 800 meters east of the tip of the morro do leme, at the edge of the deepest canal in the area, with depths of 23 meters.

as such, boaters are advised to only cross in good conditions with proper equipment.

this link shows ilha cotunduba and baixa cotunduba on a wikimapia - the link as we present it is best seen using google chrome, as it might not open correctly with other browsers.