It is one of the world's most acidic lakes.

The lagoon is an acidic lake with boiling sulfuric gases.

But while this could double the estimated number of acidic lakes in that region, he said, smaller lakes tend to be more influenced by natural acids.

Dr. Baker said the surprisingly high proportion of acidic lakes in Florida appeared to be largely a result of coal-burning power plants in the state.

A few acidic lakes in the United States, and many in Sweden, have been brought back to life by simply adding limestone to them.

Epiphytic and epilithic algae colonies also seem to be expanding in the acidic lakes and watercourses of southern Scandinavia.

They are not considered "endangered" or "threatened," but even with the lesser designation, wildlife biologists are worried about their future because many nest on acidic lakes.

The largest of these is Yu-gama, an acidic turquoise-colored lake with rafts of yellow sulfur floating on its surface.

The lake is located in the center of the volcano, and is known as one of the most acidic lakes in Japan, with a pH around 1.6.

- Episodically acidic lakes (ANC of 0-50 eq/l) have a greater capacity to neutralize acid deposition than chronically acidic ones.