Lake Bogoria is one of the only places in Africa where geysers erupt, and its shallow shoreline can turn solid pink with more than a million lesser flamingos feeding at once. The lake fills a narrow trough on the floor of Kenya's Great Rift Valley, a half-graben basin pulled open by faulting and walled on its east by the Siracho Escarpment. No river drains it, so the water has grown intensely salty and alkaline, with a pH near ten that would sting bare skin. What thrives in it is a blue-green cyanobacterium called spirulina, blooming in vast sheets, and that is the single food drawing the flamingos here. Along the western shore, heat from magma just beneath the surface breaks out as roughly two hundred hot springs and at least ten geysers, some firing scalding water five metres into the air.
Walking the geyser field is the reason most travellers come. Steam drifts off the rocks in sulphur-scented clouds, spring water hisses out close to boiling, and a geyser can fire without warning, so guides keep you back from the thin crust. Offshore, the flamingos gather in a shifting pink band that hums with a low murmur, though their numbers rise and fall with the water and the algae. The slopes above shelter one of Kenya's strongest populations of greater kudu, their spiral horns catching the light among the acacia. At dawn the water lies mirror-still, mist and birdsong blurring the line where it meets the sky; by afternoon the geysers throw their loudest plumes against the escarpment. Bogoria remains a rough National Reserve rather than a manicured park, its dusty tracks leaving you alone with the steam and the birds.