Indigenous woven backpacks called guayare are seen in front of a house in Paraitepui village, before a walking excursion to Mount Roraima, near Venezuela's border with Brazil January 13, 2015. A mysterious table-topped mountain on the Venezuela-Brazil border that perplexed 19th century explorers and inspired “The Lost World” novel is attracting ever more modern-day adventurers. (Photo by Carlos Garcia Rawlins/Reuters)

A Pemon indigenous porter walks on the road to Mount Roraima, near Venezuela's border with Brazil January 13, 2015. Once impenetrable to all but the local Pemon indigenous people, now several thousand trekkers a year make the six-day hike across Venezuela's savannah, through rivers, and up a narrow path that scales Mount Roraima's 600-meter cliff-faces. (Photo by Carlos Garcia Rawlins/Reuters)

A Pemon indigenous porter walks on the road to Mount Roraima, near Venezuela's border with Brazil January 14, 2015. (Photo by Carlos Garcia Rawlins/Reuters)

People bathe on the Tec river as they are on the road to Mount Roraima, near Venezuela's border with Brazil January 13, 2015. While that is a help to Venezuela's tottering tourism industry and brings revenues to local communities, it is also scattering a prehistoric landscape with unwanted litter. (Photo by Carlos Garcia Rawlins/Reuters)

Japanese tourists climb from a helicopter on top of Roraima Mount, near Venezuela's border with Brazil January 16, 2015. (Photo by Carlos Garcia Rawlins/Reuters)

Tourists bathe on a river at the top of Roraima Mount, near Venezuela's border with Brazil January 15, 2015. (Photo by Carlos Garcia Rawlins/Reuters)

Japanese tourists take shelter from the rain next to a rock formation on top of Roraima Mount, near Venezuela's border with Brazil January 17, 2015. (Photo by Carlos Garcia Rawlins/Reuters)

Kukenan (L) and Roraima mounts are seen from the Tec Camp, near Venezuela's border with Brazil January 14, 2015. (Photo by Carlos Garcia Rawlins/Reuters)

Stars are seen in the night sky over Kukenan (L) and Roraima mounts near the Tec Camp, near Venezuela's border with Brazil January 14, 2015. (Photo by Carlos Garcia Rawlins/Reuters)

A Pemon indigenous porter holds a light as he walks on the top of Roraima Mount, near Venezuela's border with Brazil January 16, 2015. (Photo by Carlos Garcia Rawlins/Reuters)

Tourists walk on top of Roraima Mount, near Venezuela's border with Brazil January 16, 2015. (Photo by Carlos Garcia Rawlins/Reuters)

Tourists walk on Roraima Mount, near Venezuela's border with Brazil January 15, 2015. (Photo by Carlos Garcia Rawlins/Reuters)

Pemon indigenous porters cover themselves from the rain with plastics bags on top of Roraima Mount, near Venezuela's border with Brazil January 16, 2015. (Photo by Carlos Garcia Rawlins/Reuters)

Japanese tourists walk down from the top of Roraima Mount, near Venezuela's border with Brazil January 18, 2015. (Photo by Carlos Garcia Rawlins/Reuters)

Tourists walk down from the top of Roraima Mount, near Venezuela's border with Brazil January 18, 2015. (Photo by Carlos Garcia Rawlins/Reuters)

Pemon indigenous porters walk on the road to Mount Roraima, near Venezuela's border with Brazil January 13, 2015. (Photo by Carlos Garcia Rawlins/Reuters)