Pico Viejo is a volcano located on the island of Tenerife . It is the second highest peak of Tenerife and the Canary Islands (after the Teide) with a height of 3,135 m above sea level, a huge crater approximately of 720 metres in diameter.
The volcano is part of the Teide volcanic complex, which began forming about 200,000 years ago in the centre of Tenerife. Its crater is one of the satellite craters around El Teide.
It erupted in 1798, and it is estimated that it ejected around 12 million m³ of lava over three months
forming a black coloured surface, which is different from the rest of the volcano area, which are known as the Teide noses.