The area of ​​the park is colossal - more than 38 thousand hectares, and these territories are occupied by forests and swamps, under which hydrogen sulphide mineral water is formed in one of the soil layers. This landmark of Latvia is famous for its very rich flora and fauna - for example, about 900 ferns, more than 2,200 species of moss, one hundred and fifty lichens, more than 500 species of mushrooms grow here. A quarter of the plants growing in the park are listed in the Red Book of Latvia.