The island is of volcanic origin and roughly circular; it is about 22 km (15 miles) in diameter and rises to 1487 m (nearly 5000 feet) at the island's highest peak, Garajonay. Its shape is rather like an orange that has been cut in half and then split into segments, which has left deep ravines or barrancos between them. These barrancos, in turn, are covered by the laurisilva - or laurel rain forest.
The upper reaches of this densely wooded region are almost permanently shrouded in clouds and mist, and as a result are covered in lush and diverse vegetation: they form the protected environment of Spain's Garajonay National Park, which was declared a UNESCO World Heritage Site in 1986. The slopes are criss-crossed by paths that present varying levels of difficulty to visitors, and stunning views to seasoned hikers.
The central mountains catch the moisture from the trade wind clouds and yield a dense jungle climate in the cooler air, which contrasts with the warmer, sun-baked cliffs near sea level.
Between these extremes one finds a fascinating gamut of microclimates; for centuries, the inhabitants of La Gomera have farmed the lower levels by channelling runoff water to irrigate their vineyards, orchards and banana groves.
