Mount Cameroon is one of Africa's largest volcanoes, rising to above the coast of west Cameroon. It rises from the coast through tropical rainforest to a bare summit, which is cold, windy, and occasionally dusted with snow. The massive steep-sided volcano of dominantly basaltic-to-trachybasaltic composition forms a volcanic horst constructed above a basement of Precambrianmetamorphic rocks covered with Cretaceous to Quaternary sediments. More than 100 small cinder cones, often fissure-controlled parallel to the long axis of the massive volcano, occur on the flanks and surrounding lowlands. A large satellitic peak, Etinde, is located on the southern flank near the coast. Mount Cameroon has the most frequent eruptions of any West African volcano. The first written account of volcanic activity could be the one from the CarthaginianHanno the Navigator, who may have observed the mountain in the 5th century BC. Moderate explosive and effusive eruptions have occurred throughout history from both summit and flank vents. A 1922 eruption on the southwestern flank produced a lava flow that reached the Atlantic coast. A lava flow from a 1999 south-flank eruption stopped 200 mfrom the sea, cutting the coastal highway.
Flora
The mountain's natural vegetation varies with elevation. The main plant communities on the mountain include:
Lowland rain forest predominates on the lower slopes, from sea level to 800 meters elevation. The lowland forests are part of the Cross-Sanaga-Bioko coastal forests ecoregion. They are composed of evergreen trees with a dense canopy 25 to 30 meters high, with taller emergent trees rising above the canopy. Many trees have buttress roots. The forests are diverse and species-rich, with numerous lianas. Much of the lowland forest has been converted to agriculture and agroforestry, including oil palm plantations.
Lower montane forest, also known as submontane forest or cloud forest, grows between 800 and 1,600 meters elevation. The lower montane forests are composed of evergreen trees, which form a 20 – 25 meter-high canopy that is either closed or discontinuous. There are scattered areas of meadow and scrubland, with grasses, herbs, tall herbaceous plants, tree ferns, woody shrubs, and low trees. Frequent clouds and mists sustain profuse epiphytes, including mosses, ferns, and orchids. The lower montane forests are diverse and species-rich, with characteristic Afromontane plants and endemic species. Impatiens etindensis and I. grandisepala are herbaceous epiphytes endemic to the montane forests of Mount Cameroon. The lower montane forests, together with the higher-elevation forests, scrub, and grasslands, are part of the Mount Cameroon and Bioko montane forests ecoregion.
Upper montane forest grows from 1,600 – 1,800 meters elevation. Trees up to 20 meters high form an open-canopied forest with numerous epiphytes. The upper montane forests are less species-rich than the lower-elevation forests, and fires are more frequent.
Montane scrub grows between 1,800 and 2,400 meters elevation. Low trees of 1 to 15 meters form open-canopied forests, woodlands, and shrublands, with an understory of small shrubs, herbs, ferns, and climbers.
Montane grassland occurs between 2,000 and 3,000 meters elevation. The dominant vegetation is tussock grasses, with scattered fire-tolerant shrubs and low trees.
Sub-alpine grassland is found at the highest elevations, from 3,000 to over 4,000 meters. Frost-tolerant tussock grasses, dwarf trees and shrubs, and crustose, foliose, and fruticose lichens predominate.
Mount Cameroon National Park was created in 2009. It covers an area of 581.23 km². The park includes the former Etinde Forest Reserve and most of the Bomboko Forest Reserve. A portion of the Bomboko Forest Reserve remains outside the park, on the lower northern slopes of the mountain.
