The crystalline bedrock is located at a depth of 1000–1200 meters, with Cambrian Deimena Formation, which in turn has a 99-meter-thick layer of beige shale that distinguishes it from Ordovician rocks.

The lake itself is one of the medium-low-nutrient water bodies with benthic pine algae assemblages.

Together with Schoenus ferrugineus and Cladium mariscus, the fen vegetation provides habitat for species that are rare in Latvia — sweet gale (Myrica gale), Dactylorhiza incarnata, Dactylorhiza cruenta, Liparis loeselii, Gymnadenia conopsea and Ophrys insectifera and the rare mosses Irish ruffwort (Moerckia hibernica)[8] and riccardia (Riccardia multifida)[9] also are found there.

In addition the alliance, Caricetum lasiocarpae, typical for the coastal lowland of Latvia, is also protected.

Four species are listed in the Red Data Book of Latvia[12] — common spadefoot (Pelobates fuscus), natterjack toad (Bufo calamita), smooth snake (Coronella austriaca) and sand lizard (Lacerta agilis).