published by the project lagoa limpa, the webpage on this link shows a cool animation of how the lagoon evolved during the last 1000 years, and clearly shows ipanema beach right across from it, the statue of christ on corcovado, the sugar loaf in the far back, and the hippodrome in gávea. 

for those interested in learning more about the neighborhood of lagoa, we have more detailed information in our neighborhoods section.

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