The wonders of the lake

The colour is the first shock. In the shallows, the water turns red, orange, and pink. The pigment comes from salt-loving cyanobacteria and algae, which bloom when salinity and sun are high. Fresh natrocarbonatite ash from Lengai washes into the same basin and feeds the chemistry. NASA has recorded spring-fed patches hot enough to reach about 60 °C. Midday air on the mudflats regularly passes 40 °C, and surface crusts can be far hotter.

The lake is a closed basin. The Ewaso Ng’iro, rising in Kenya, is the main inlet, with the Engare Sero and other springs and seasonal streams adding water that then evaporates. What remains is brine. A white crust of sodium carbonate forms, breaks, and reforms as the level moves. From the escarpment, the effect is lunar: red water, white salt, a grey volcano, and almost no shade.

One famous claim is wrong. Natron does not turn animals to stone. Birds that die in the brine can become coated in soda salts and look calcified in photographs. The living lake is a breeding ground, not a curse.

The other wonder is the volcano. Ol Doinyo Lengai, about 2,962 metres, is the only volcano on Earth that still erupts natrocarbonatite lava, unusually cool for lava at about 500 to 600 °C and fluid enough to look like black mud before it weathers white. Maasai tradition calls it the Mountain of God. The cone, the lake, and the flamingos are one landscape.

Wildlife & Flamingos of Natron Lake

The lesser flamingo is the reason the lake is protected. Eastern Africa holds about 1.5 to 2.5 million birds, roughly three-quarters of the world population, and most of them hatch at Natron. BirdLife International treats the lake as East Africa’s only regular large breeding site. Flocks feed on the cyanobacteria. They nest on soda-mud islands in the middle of the lake, where jackals, hyenas, and other mammals cannot cross the brine. One egg is the usual clutch. Breeding is erratic, tied to water level and food, not to a fixed month. Peak activity often falls between August and October, and also in other months when the flats are right. In a poor year, the colonies are quiet. In a good year, the shore looks pink to the horizon.

Other birds use the springs and the less alkaline edges: greater flamingos in smaller numbers, pelicans, ducks, waders, and raptors including fish eagles near fresh inflows. The lake itself has almost no fish. Alkaline tilapia and a few specialists survive in the streams and spring mouths, not in the open brine.

On land, the game is rift-valley rather than Serengeti. Zebra, giraffe, Grant’s gazelle, and ostrich move along the shore and the Engare Sero River. Golden jackals and spotted hyenas work the margins. The escarpment and the volcano slopes are Maasai grazing country. There is no classic big-cat safari here. The spectacle is the flock, the salt, and the mountain.

Nearby, and not in the lake, are the hominid footprints preserved in volcanic ash, and the waterfalls of the Engare Sero gorge. Both are half-day walks from the village, and both are a better use of the hot afternoon than standing on the crust.

Weather around Lake Natron

Natron is hot and dry, with two wet seasons. The long rains run from about March to May, with April the wettest month on the approach. The short rains fall mainly in November, usually as afternoon storms. June to October is the long dry season. January and February are the hottest dry gap.

TAWA puts typical temperatures between about 20 and 35 °C, and notes that January and February often exceed 40 °C. Operator climate tables show average highs from about 31 °C in July to 38–39 °C in January and February, with nights dropping to about 17–18 °C in the cooler dry months and staying near 22 °C in the hot season. Rainfall on the lowlands is often under 500 millimetres a year, higher on the escarpment. Evaporation exceeds rainfall. That is why the lake stays salty.

Wind, dust, and glare are the daily conditions. Shade is scarce. The climb of Lengai is done at night because a daytime ascent in this heat is unsafe. June to October, and the drier weeks of January and February, are the reliable months for roads and for firm ash on the volcano. March to May can close the escarpment track.

Come for the red water and the flock, not for a swim. Bring more water than feels necessary, a hat, and a guide who knows which crust will hold. The wonder of Natron is that millions of birds depend on a lake that would burn everything else.