Like other tepuis, Mount Roraima's summit harbors a "lost world" ecosystem that has been sheltered from the surrounding region for about 70 million to 90 million years, according to a 2012 study.

Roraima & the Angel Falls – 12 days walking in Venezuela. Walks Worldwide has introduced a new small group trip to Venezuela for 2011 entitled Roraima & the Angel Falls. Mysterious Roraima towers ...

Mount Roraima is a flat-topped formation with crystal-clear pools, waterfalls and a unique ecosystem that has been isolated from the surrounding savanna for millions of years.