It rises dramatically over 300 meters above the surrounding terrain.
The summit is 663 meters above sea level and is often covered by clouds.
When it rains the stone is like a huge glass bottle,said one climber.
The approach to the rocky tower is impeded by a impenetrable forest of giant ferns and lianas.
Snakes are reportedly everywhere, even on the tower.
Both islands are part of an extinct volcanic mountain range.
Sao Tome, the island where Pico Cao Grandeis located, is 50 km long and 30 km wide.
