A remote mountain ridge in West Africa holds secrets of evolution and rare life

Countries & Cities · Published 29 September 2026 Swipe more like this →

In short: Straddling the borders of Guinea and Côte d'Ivoire, the Mount Nimba Strict Nature Reserve is a biological treasure chest. This isolated sky island hosts species found nowhere else on Earth, from viviparous toads to tool-using chimpanzees, yet its unique geomorphology faces a constant, looming threat from industrial iron-ore mining.

The Mount Nimba Strict Nature Reserve encompasses 175.4 square kilometers of the Nimba Range, a narrow, 40-kilometer-long ridge that rises sharply from the surrounding lowlands. Its highest point, Mount Richard-Molard, reaches 1,752 meters, serving as the tallest peak for both Guinea and Côte d'Ivoire. This dramatic elevation gain creates a sub-equatorial montane climate, where temperatures can swing from a daytime high of 33 degrees Celsius to below 10 degrees Celsius at night. The range acts as a critical watershed, housing roughly fifty springs that feed the Cavally, Cestos, and Sassandra Rivers.

The reserve is a biodiversity hotspot, sheltering over 2,000 vascular plant species and 680 vertebrate species. Its isolation as a sky island has fostered high levels of endemism; unique inhabitants include the Nimba otter shrew, the Lamotte's roundleaf bat, and the Nimba viviparous toad. Beyond these rarities, the area supports populations of western chimpanzees that have been observed utilizing stones as tools, alongside endangered species like the pygmy hippopotamus and the zebra duiker. The landscape itself is a complex mosaic, transitioning from lowland forests to mossy montane forests and high-altitude grasslands.

Despite its ecological significance, the site has been classified as a World Heritage Site in danger since 1992, the same year iron-ore exploration began in its most vulnerable zones. While the Guinean portion remains largely intact, the Liberian section of the ridge has suffered significant degradation from past mining activities. To bolster protection, a new conservation management center was approved in 2016 by the Guinean government and the Centre for Environmental Management of Mount Nimba (CEGENS). This effort reflects the ongoing tension between preserving a globally unique geomorphological feature and the economic allure of the high-quality iron-ore deposits buried within the range.

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