any of rio's beaches may have polluted waters within 24 to 48 hours following heavy rains - while cleaning is underway, many of ilha do governador's beaches are normally not suitable for swimming.

this link shows praia do saco do pinhão on a wikimapia - the link as we present it is best seen using google chrome, as it might not open correctly with other browsers. 

on rio's bus signs, this bus terminal is referred to as 'castelo.'  the name is due to the former presence in that area of a hill home to a fort called 'morro do castelo' (hill of the castle).