Namarunu is a shield volcano located in the Great Rift Valley, Kenya.

The large basal part is about 200 metres (660 ft) deep, made up of outward-dipping trachytic lavas, breccias and tuffs.

It is a trachytic shield volcano topped by more recent parasitic cones and lava flows.

[2] Large amounts of basalt were deposited in the Rift valley on the north, east and south of the volcano through effusion and explosions during the early Holocene.

A breached scoria cone that forms the summit of the mountain also erupted fluid olivine basalts, with some eruptions later than the period around 3,000 years ago when Lake Suguta dried out.