Today it gets rocky, dusty and sandy, as we ride165 km east on winding gravel surfaces and out into the savannah landscape of the Maasai plains. We make our way to the Great Rift Valley, at the foot of which stands the mighty Ol Donyo Lengai volcano. The Ol Donyo Lengai is an active volcano that last erupted in 2008. The Maasai see it as the seat of their god "Ngai". The almost-perfect cone of this big boy rises above an area of astonishing barren beauty. At the foot of the mountain is an area of stony desert. Here we will find the cones of small extinct volcanoes and Lake Natron, a huge soda lake that stretches to the Kenyan border. Flamingos come here to breed, and in the late midday sun the colourful flamingo colonies make a spectacular sight, adding a splash of colour on the shimmering water.