The territory of the park is mostly occupied by forests and mires, the most significant of them being The Great Ķemeri Bog (Latvian: Lielais Ķemeru tīrelis).

Many of the out flowing streams have been altered over history to drain the marshland for agriculture, however the waters still support a wide variety of rare species, such as native snails and mussels, fishers, storks and otters.

The bog is home for a number of Latvian bird species, such as the Common crane, Wood Sandpiper and European Golden Plover.

Thus, the flora is specifically adapted to these conditions such as Eriophorum vaginatum, Calluna vulgaris, Ledum palustre, Rhynchospora alba, Andromeda polifolia, Drosera, Pinus sylvestris and Sphagnum.

Ķemeri National Park has many natural sulfur springs, due to its sublayer of gypsum and soil bacteria (Desulfovibrio desulfuricans), forming H2S gas which easily dissolves in the water.