Brooding and primeval, the forests of Udzungwa seem positively enchanted: a verdant refuge of sunshine-dappled glades enclosed by 30-metre (100 foot) high trees, their buttresses layered with fungi, lichens, mosses and ferns.

Udzungwa is the largest and most biodiverse of a chain of a dozen large forest-swathed mountains that rise majestically from the flat coastal scrub of eastern Tanzania. Known collectively as the Eastern Arc Mountains, this archipelago of isolated massifs has also been dubbed the African Galapagos for its treasure-trove of endemic plants and animals, most familiarly the delicate African violet.

Udzungwa alone among the ancient ranges of the Eastern Arc has been accorded national park status. It is also unique within Tanzania in that its closed-canopy forest spans altitudes of 250 metres (820 feet) to above 2,000 metres (6,560 ft) without interruption.