This unusual sight can be seen in the San Francisco Bay where artificial pond water evaporates and leaves only crystallized salt, coloured algae and micro-organisms. Ponds with low or medium salinity have a green or pink colour and as the salinity increases, the water takes on a more reddish pigment. In addition, the weather also influences the colour of the body of water as more rain makes the water more transparent.
A popular tourist attraction in Indonesia, this muddy pond erupts with an explosion of mud and a plume of white steam every two minutes and these eruptions also shift positions from time to time. Bledug Kuwu, is the local name for something that burst in a pool and visitors can watch the geyser from a distance of 10-20 meters away.