Valkjärvi is a

lake A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much large ...

located in the Nurmijärvi municipality in

Southern Finland Southern Finland ( fi, Etelä-Suomen lääni, sv, Södra Finlands län) was a province of Finland from 1997 to 2009. It bordered the provinces of Western Finland and Eastern Finland. It also bordered the Gulf of Finland and Russia. History O ...

. It is an island-free lake in the immediate vicinity of Klaukkala's urban area. The water flows from the lake along the Luhtajoki River all the way to the

Vantaa River The Vantaa ( fi, Vantaanjoki, ) is a long river in Southern Finland. The river starts from the lake in Hausjärvi and flows into the Gulf of Finland at ' in Helsinki. One of the tributaries of the Vantaa river is Keravanjoki that flows throug ...

. Valkjärvi is the most lushest lake of Nurmijärvi,Jorma Keskitalo: Kasviplanktonlajisto ja –biomassa Uudenmaan seurantajärvillä 2014 – 2015. (in Finnish) and it is part of the Nurmijärvi's lake monitoring program of the Central Uusimaa Environment Centre (''Keski-Uudenmaan ympäristökeskus'') due to its poor oxygen values near the bottom of the lake, which are observed especially in summer and winter under ice.Valkjärvi
- Keski-Uudenmaan ympäristökeskus (in Finnish)

Blue-green algae Cyanobacteria (), also known as Cyanophyta, are a phylum of gram-negative bacteria that obtain energy via photosynthesis. The name ''cyanobacteria'' refers to their color (), which similarly forms the basis of cyanobacteria's common name, bl ...

are quite common in the lake; in July 2015, the

phytoplankton Phytoplankton () are the autotrophic (self-feeding) components of the plankton community and a key part of ocean and freshwater ecosystems. The name comes from the Greek words (), meaning 'plant', and (), meaning 'wanderer' or 'drifter'. Ph ...

in the lake with the highest total biomass consisted of 40% cyanobacteria and 29%

cryptomonad The cryptomonads (or cryptophytes) are a group of algae, most of which have plastids. They are common in freshwater, and also occur in marine and brackish habitats. Each cell is around 10–50 μm in size and flattened in shape, with an anteri ...

. Despite all this, Valkjärvi has great recreational value and there are quite a lot of both permanent and holiday settlements around the lake. There are two

beach A beach is a landform alongside a body of water which consists of loose particles. The particles composing a beach are typically made from rock, such as sand, gravel, shingle, pebbles, etc., or biological sources, such as mollusc shel ...

es at the southern end of Valkjärvi: Tiiranranta Beach and Lähtelä Beach.Uimarannat ja -paikat
- Nurmijärvi.fi (in Finnish)

References

External links

Valkjärvi's location
at Fonecta Nature of Nurmijärvi Lakes of Finland Vantaa River basin {{Finland-lake-stub