East Africa’s Flamingo Lakes: Bogoria, Nakuru, and the Alkaline Secret

Lakes Bogoria and Nakuru in Kenya’s Rift Valley are among the most alkaline bodies of water on Earth, with pH levels approaching 12 in some areas. This extreme chemistry is lethal to most fish and aquatic life, but it creates ideal conditions for spirulina — the blue-green cyanobacterium that is the primary food source for hundreds of thousands of lesser flamingos.

At peak aggregation, the lake surface appears pink from a distance — a shimmering, shifting carpet of birds that creates one of Africa’s truly unmissable spectacles. Counts at Lake Bogoria have exceeded 1.5 million individual birds in a single survey.

Greater flamingos also feed at these lakes, but their diet is more varied — invertebrates and small fish — and their larger size distinguishes them clearly from the shorter, deeper-pink lesser flamingos.