[2] It can be found near Tukuyu, a small town in the highland Rungwe District, Mbeya Region, of southern Tanzania in East Africa.

The inner caldera is forested with Maesa lanceolata, Albizia gummifera and Hagenia abyssinica, far fewer tree species than neighbouring mountains consistent with the recent geological origin of the volcano.

The caldera itself is not subjected to hydrothermal activity, but large subaqueous CO2 emissions and local legends of the killing power of the lake indicate a danger of limnic eruptions.

Nyakyusa elders dispelled the area by rolling a huge boulder which had been placed in the heart of a fire for three days into the water, while casting their own spells.

Some variations of the myth suggest that this caused an emission of poisonous gasses (which we now know could be linked to a Limnic eruption), while others claim that there is a twelve headed snake that protects the treasure and comes out to the surface on sunny days.