Lake Nakuru is one of the Rift Valley soda lakes at an elevation of 1,754 m (5,755 ft) above sea level. It lies to the south of Nakuru, in the rift valley of Kenya and is protected by Lake Nakuru National Park.

The lake's abundance of algae used to attract a vast quantity of flamingos that famously lined the shore.

The lake is world-famous as the location of the greatest bird spectacle on earth - myriads of fuchsia pink flamingos whose numbers are legion, often more than a million - or even two million. They feed on the abundant algae, which thrives in the warm waters. Scientists reckon that the flamingo population at Nakuru consumes about 250,000 kg of algae per hectare of surface area per year.

There are two types of flamingo species: the lesser flamingo can be distinguished by its deep red carmine bill and pink plumage unlike the greater, which has a bill with a black tip. The lesser flamingos are ones that are commonly pictured in documentaries mainly because they are large in number.

In 2013, the lake received an alarming increase in the water levels that led to the migration of flamingos to Lake Bogoria in search for food supply. 

In recent years, there have been wide variations between the dry and wet seasons' water levels. It is suspected that this is caused by increasing watershed land conversion to intensive crop production and urbanization, both which reduce the capacity of soils to absorb water, recharge ground water and thus increase seasonal flooding. Pollution and drought destroy the flamingos' food, Cyanobacteria, or blue-green algae, and causing them to migrate to the nearby Lakes, more recently lakes Elmenteita, Simbi Nyaima and Bogoria. Local climate changes have also been hypothesized to contribute to the changing environmental conditions in the lakes catchment. Recent media reports indicate increasing concern among stakeholders, as mass flamingo migrations and deaths could spell doom to the tourism industry.

Lake Nakuru is protected under the Ramsar Convention on wetlands