This is amazing footage from the BBC documentary series Africa. What you see are toxic soda lakes, a chain of lakes that run through East Africa. The water is toxic because it´s poisoned by volcanic springs.
The face of the lakes changes day by day when the sun evaporates the water and leave the salts behind.
The incredible colors is due to algae, specially adapted to live in this corrosive liquid.
The algae feed the flamingos, who gather in these waters whenever the algae bloom.
You can watch this in episode 2 Savannah on Dailymotion.
Here are the rest of the episodes: