Timanfaya National Park is located in the southwestern part of the island of Lanzarote.
The parkland is entirely made up of volcanic soil.
The greatest recorded eruptions occurred between 1730 and 1736. The volcanic activity continues as the surface temperature in the core ranges from 100 to 600 °C at the depth of 13 metres (43 ft), which is demonstrated by pouring water into the ground, resulting in a geyser of steam which is an attraction for tourists. There is only one active volcano, Timanfaya volcano which the park is named after.
Source and more informations: Timanfaya National Park - Wikipedia