Reflection of rock formation in South Tufa on Mono Lake against blue sky at dusk, Mono County, Sierra Nevada, Eastern California, California, USA
Lake Natron in northern Tanzania is one of the most alkaline of the Rift system. As its waters evaporate in the intense heat, sodium sesquicarbonate, known as trona or natron
Lesser flamingos feed on Lake NatronIn the late afternoon, lesser flamingos feed on Lake Natron with Shompole volcano (situated on the border of Kenya and Tanzania) in the distance at the northern end of the lake
From the air, a pink band of Lesser flamingos hugs the barren shoreline of this intensely alkaline Rift Valley lake. The colour of the water is the result of green algae with high chlorophyll
The Uaso Nyiru delta from the air. This freshwater river flows through southern Kenya and enters the northern end of Lake Natron only to become alkaline in the closed basin of this Tanzanian Rift
Greater flamingos in flight over Lake Turkana. This Rift Valley lake is a favourite haunt of both greater and lesser flamingos because the blue-green algae upon which they feed grows in the lakes
The alkaline waters of Lake Bogoria are a favourite haunt of lesser flamingos. The barren shoreline is dotted with steam jets and geysers reflecting its volcanic origins
Greater flamingos (Phoenicopterus ruber) stand watch over their eggs and chicks at Lake Bogoria. Only on very rare occasions do the birds breed on this warm, alkaline lake
Tens of thousands of lesser flamingos (Phoeniconaias minor) line the shores of Lake Bogoria, feeding on blue-green algae (Spirulina platensis) that grows profusely in its warm alkaline waters
Tufa formations at Mono Lake at sunrise, Mono Lake Tufa State Reserve, Sierra Nevada, California, USA
Rock formation at South Tufa, Mono Lake, Mono County, Sierra Nevada, Eastern California, California, USA
Rock formation at South Tufa on sunny day, Mono Lake, Mono County, Sierra Nevada, Eastern California, California, USA
Lesser flamingos flying over Lake Logipi, a seasonal alkaline or soda lake at the northern end of the Suguta Valley
The lava barrier that separates the southern end of Lake Turkana from the Suguta Valley. South Island is in the distance while the extinct volcanic crater, Abil Agituk, is close to the lakeshore
An extinct volcanic crater, Abil Agituk, at the southern end of Lake Turkana has a distinctively green crater lake which is fed by underground seepage from the main lake
The inhospitable country at the southern end of Lake Turkana. The fresh-looking lava flows came from Telekis Volcano which last erupted about 130 years ago
A grants gazelle walks past thousands of lesser flamingos feeding on algae along the shores of Lake Bogoria which is one of a series of alkaline lakes in Kenyas Rift Valley system
Lake Bogoria is one of a series of alkaline lakes in Kenyas Rift Valley system and a favourite place to see thousands of lesser flamingos
Western wall of the Great Rift Valley above Lake ManyaraA section of the western wall of the Gregory Rift (a part of the eastern branch of the Africas Great Rift Valley) above Lake Manyara, a shallow alkaline lake
Lake Natron in the Rift ValleyLake Natron in northern Tanzania is one of the most alkaline of the Rift system. As its waters evaporate in the intense heat, sodium sesquicarbonate, known as trona or natron
The alkaline waters of the seasonal Lake Logipi, situated at the northern end of the Suguta Valley, are a favourite haunt of lesser flamingos because the blue-green algae upon which they feed grows
A greater flamingo takes off from the alkaline waters of Lake Bogoria. This Rift Valley lake is a favourite haunt of both greater
A Msai warrior speaks on his mobile phone from the saddle of his camel near Lake Magadi in Kenyas Rift Valley Province. Mobile phones are a popular method of communicating with family
Msai men lead a camel caravan laden with equipment for a fly camp (a small temporary camp) past Lake Magadi. Clouds hang low over the Nguruman Escarpment (a western wall of the Great Rift Valley)
Lesser flamingos (Phoeiniconaias minor) in flight over Lake Nakuru, an alkaline lake of the Rift Valley system where tens of thousands of them may be seen lining the shores for many months of the year
A hardy Commiphora tree thrives beside Lake Magadi, an alkaline lake of the Rift Valley system, situated in a vey hot region of southern Kenya
