The Blue Lake is in the crater of an extinct volcano which erupted around 4,500 years ago.
Like its name, the lake is in cobalt blue colour.
It was founded by an Indian in 1924.
The water of the lake is so clear that human eye can see to its bottom.
It has depth of 72metres.
The Blue Lake changes its colour in November and December.
It is located in a city, but still has very little human impact.