Walking through Teno is like finding an island within an island. This mountainous area, at over 1,300 metres above sea level, covers the extreme eastern part of Tenerife and is almost completely surrounded by the sea. In fact, in the distant past Teno was a small separate island, which then joined with other sections to become a single mass of land that is today called Tenerife. This relative geographic isolation has meant the ravines and narrow valleys have conserved a unique biodiversity, architecture and set of customs and habits, which you probably won't find in the Tenerife of mass tourism and populated resorts.