Mount Roraima

Mount Roraima is the most famous tepui (flat-topped mountain) in South America - a 2,810-meter tabletop mountain at the triple border of Venezuela, Brazil, and Guyana that inspired Arthur Conan Doyle's novel "The Lost World." Its sheer sandstone cliffs rise 400 meters above the surrounding Gran Sabana savanna, and its summit is a surreal landscape of bizarre rock formations, crystal pools, and endemic plants found nowhere else on Earth.

The trek to Roraima's summit is one of South America's most epic multi-day hikes - typically a 6-day round trip from the village of Paraitepui. The route crosses open savanna, fords rivers, ascends through cloud forest, and finally scrambles up the only viable route to the summit via a natural ramp. The summit itself is otherworldly - 31 square kilometers of eroded sandstone sculptures, crystal-clear natural swimming pools, unique carnivorous plants, and endemic species.

Standing on the summit, you can see into three countries simultaneously. Rock overhangs called "hotels" provide shelter for camping, and the silence and isolation at the top are profound. The surrounding Gran Sabana is a vast savanna dotted with tepuis and waterfalls, home to indigenous Pemón communities.

The driest months (December-March) offer the best trekking conditions, though rain is possible any time on the summit. October-November are also reasonable. The wet season (May-August) makes river crossings dangerous.