Walk 45 GR 131 – La Caldera to La Esperanza
APPENDIX A Route summary table
APPENDIX B Topographical glossary
APPENDIX C Useful contacts
Morning mist clears above Erjos, revealing the mighty form of El Teide (Walk 13)
INTRODUCTION
Looking up the Barranco de Igueste, with tabaibal and cardón scrub growing thick on the slopes (Walk 2)
The seven sub-tropical Canary Islands bask in sunny splendour off the Atlantic coast of north-west Africa. Millions of sun-starved north Europeans flock there for beach holidays, but increasingly visitors are discovering the amazing variety of landscapes throughout the archipelago. Conditions range from semi-deserts to perpetually moist laurisilva ‘cloud forests’, from rugged cliff coasts to high mountains, from fertile cultivation terraces to awesome rocky barrancos carved deep into multi-coloured layers of volcanic bedrock. Some areas are given the highest possible protection as national parks, but there are many more types of protected landscapes, rural parks, natural monuments and nature reserves.
More and more walkers are finding their feet, exploring the Canary Islands using centuries-old mule tracks, rugged cliff paths and forest trails. Paths pick their way between cultivation terraces, squeeze between houses and make their way to rugged coves and hidden beaches. Some paths run from village to village, following old mule tracks once used to transport goods, while other paths are based on pilgrim trails to and from remote churches and ermitas. Many have been cleared, repaired, signposted and waymarked in recent years, ready to be explored and enjoyed.
This guidebook explores many waymarked trails on the island of Tenerife. This large island boasts routes of all types – from easy strolls to hands-on scrambling, from simple day-walks to long-distance trails. As these routes are fully signposted and waymarked, walkers can follow them with confidence and enjoy the island to the full. Almost 630km (390 miles) of trails are described in this guidebook.
Location
The Canary Islands are more or less enclosed in a rectangular area from 13°30′W to 18°00′W and 27°30′N to 29°30′N. As a group, they stretch west to east over 450km (280 miles). Although administered by Spain, the mother country is 1100km (685 miles) away. The narrowest strait between the Canary Islands and Africa is a mere 110km (70 miles). The total land area is almost 7500km (2900 square miles), but the sea they occupy is 10 times that size.
Geology
Most of the world’s volcanic landscapes are formed where huge continental or oceanic ‘plates’ collide with each other. When continental plates collide, the Earth’s crust crumples upwards to form mountains, and when plates are torn apart, basaltic rock from deep within the Earth’s mantle erupts to form mountains. The Canary Islands, however, are different, and have a complicated geological history.
El Teide vents hot gases and steam from fumaroles; this one is very close to the summit (Walks 37–40)
The African landmass is the visible part of a continental plate that extends into the Atlantic Ocean, but the Canary Islands lie within the oceanic crust of the eastern Atlantic Ocean, close to the passive junction with the African continental plate. It is thought that the islands now lie directly above a hot-spot, or mantle plume, some 2500km (1550 miles) deep within the Earth. The mantle plume is fixed, but the oceanic and African plates are drifting very slowly eastwards. Every so often a split in the oceanic crust opens above the mantle plume, allowing molten rock to vent onto the ocean floor. As more and more material erupts, it piles higher and higher until it rises from the sea. Each of the Canary Islands was formed this way.
Lanzarote and Fuerteventura were the first Canary Islands to form, and were subsequently pulled eastwards. The next time a rift opened over the mantle plume the islands of Gran Canaria and Tenerife were formed, and these were in turn pulled eastwards. A further oceanic rift led to the formation of La Gomera, La Palma and El Hierro. Looking forward in geological time more islands will appear as other rifts are torn open in the future.
The forces at work deep within the Earth can scarcely be imagined. Every single piece of rock throughout the Canary Islands once existed in a molten state. Consider the energy needed to melt one small stone, and multiply that to imagine the energy required to melt everything in the island chain, as well as the immense amount of rock beneath the sea that supports them all!
Over time huge amounts of volcanic material were piled high, but erosion has led to great instability. During recent geological time vast chunks of the islands have collapsed into the sea, creating features such as El Golfo on El Hierro, the Caldeira de Taburiente on La Palma and the Orotava valley on Tenerife. With each catastrophic collapse, tidal waves devastated places around the Atlantic Ocean. Some geologists believe that the steep, bulging northern slope of El Teide could collapse during any future volcanic eruption.
Wildlife
Plants and flowers
While the northern hemisphere was in the grip of an Ice Age, the Canary Islands were sluiced by rainstorms, with powerful rivers carving deep, steep-sided barrancos into unstable layers of ash and lava. As the landmasses emerged from the Ice Age the Canary Islands dried out and the vegetation had to adapt to survive. Some species are well adapted to semi-desert conditions, while on some high parts of the islands, laurisilva cloud forests are able to trap moisture from the mists and keep themselves well watered. Laurisilva forests once spread all the way round Mediterranean and tropical regions, and extensive examples of these forests thrive on Tenerife.
Canary pines flourish on high, dry mountainsides, sometimes in places where nothing else grows. A collar of pine forest, known as the Corona Forestal, surrounds the highest mountains on Tenerife. Almost every pine you see will have a scorched trunk, but they regenerate surprisingly well after forest fires. Beware of the long pine needles on the ground, as they are slippery underfoot. Canary palms also flourish in dry places, and in the past every part of the tree had a use; today they provide delicious miel de palma, or palm syrup. Every so often dragon trees occur, the last surviving descendants of the ancient prehistoric forests. They have been decimated in the wild but prove popular in gardens.
Tagasaste trees are often found in dense plantations, always in places where livestock are grazed. They grow with little water, yet have a high nutritional content and are regularly cut for animal fodder. In recent years they have been exported to Australia. Junipers are common; fruit and nut trees have been established, including apples, oranges, lemons, bananas, almonds, figs and vines. The introduced prickly pears are abundant, not so much for their fruit, but for raising cochineal beetles, whose blood provides a vivid red dye.
Bushy scrub is rich and varied, including sticky-leaved cistus and a host of species that walkers should learn to identify. These include
