Soda Lakes and Escarpments

The valley floor's alchemy

The Rift Valley is not simply a crack in the landscape — it is a chain of chemical worlds, each lake shaped by the alkaline soils and geothermal heat that the faulting earth releases. Lakes Nakuru, Bogoria, Elementaita and Magadi sit in the valley's floor at different elevations, each one a slightly different concentration of sodium carbonate and bicarbonate, fed by hot springs and sealed by evaporation. The result is water that almost nothing can live in — except, spectacularly, cyanobacteria, the blue-green algae that turns the shallows pink with the bodies of the flamingos that feed on it.

Lake Bogoria makes the strongest case for the valley's theatrical instincts. Its hot springs and geysers hiss and boil at the lake's eastern shore, and lesser flamingos gather here in numbers that colour the water's edge for kilometres. Lake Nakuru, a national park since 1961 and now enclosed against poaching, layers that flamingo spectacle with rhino, leopard and a birdlist that can exceed four hundred species on a good morning. Further south, Elementaita's shallower waters attract great white pelicans nesting on its central island, and the whole lake lies in a curve of escarpment that looks, in late afternoon light, like something painted rather than real.

The escarpments themselves are as dramatic as the water below. The Mau and Kinangop scarps rise nearly a kilometre above the valley floor in places, forested on their upper slopes and cut by waterfalls where seasonal rivers find the edge. From the top of the Rift's western wall, looking east across the soda lakes toward the volcanoes of Longonot and Suswa, you understand that this is not a settled landscape — it is one still in motion, still deciding what it wants to be.