Tepuis are flat table-top mountains found in the Guayana Highlands of South America, especially in Venezuela.
The tallest of them are over 3,000 meters tall.
Over millions of years, the plateaus were eroded and all that were left were isolated flat-headed tepuis.
Although the tepuis looks quite barren, the summit is teeming with life.
The high altitude of tepuis causes them to have a different climate from the ground forest.
Many extraordinary plants have adapted to the environment to form species unique to the tepui.
Approximately one-third of the species occur nowhere else in the world.
The most famous among them is Mount Roraima.
Roraima, was unexplored until 1884.
Mount Roraima is said to have inspired the Scottish author Arthur Conan Doyle to write his novelThe Lost World.
The other famous tepui is Auyantepui, home to Angel Falls, the highest waterfall in the world.
Auyantepui is also the largest of the tepuis with a surface area of 700 km2.
