Lake Tuusula is a lake

Lake

A lake is a body of relatively still fresh or salt water of considerable size, localized in a basin, that is surrounded by land. Lakes are inland and not part of the ocean and therefore are distinct from lagoons, and are larger and deeper than ponds. Lakes can be contrasted with rivers or streams,...

 on the border of the municipalities of Tuusula

Tuusula

Tuusula is a municipality of Finland. It belongs to the Helsinki sub-region of the Uusimaa region. The municipality has a population of .-Geography:...

 and Järvenpää

Järvenpää

Järvenpää is a town and municipality of Finland.-History:Järvenpää was separated from its parent community Tuusula in 1951. Järvenpää was granted the status of a market town after the separation. Neighbouring districts Kellokoski and Nummenkylä were not added to the municipality of Järvenpää and...

 in Southern Finland

Southern Finland

Southern Finland was a province of Finland from 1997 to 2010. It bordered the provinces of Western Finland and Eastern Finland. It also bordered the Gulf of Finland and Russia.- History :...

. The lake has an area of 6.0 square kilometres. Since the beginning of the twentieth century the shores of Lake Tuusula has been an artist's colony. The houses of Jean Sibelius

Jean Sibelius

Jean Sibelius was a Finnish composer of the later Romantic period whose music played an important role in the formation of the Finnish national identity. His mastery of the orchestra has been described as "prodigious."...

, Juhani Aho

Juhani Aho

Juhani Aho, originally Johannes Brofeldt, was a Finnish author and journalist.Aho's literary output is wide-ranging since he pursued different styles as time passed....

, Pekka Halonen

Pekka Halonen

Pekka Halonen was a painter of Finnish landscapes and people. He lived with his family in a home and studio on Lake Tuusula in Järvenpää, Finland that he, himself, designed and named Halosenniemi. The beautiful and serene building is now a museum that includes original furnishings and Halonen’s...

, Eero Järnefelt

Eero Järnefelt

Eero Erik Nikolai Järnefelt was a Finnish realist painter.Eero Järnefelt was born in Viipuri, Finland. His father August Aleksander Järnefelt was an officer in the Russian army and his mother was Elisabeth Järnefelt . He studied at the St...

, Joonas Kokkonen

Joonas Kokkonen

Joonas Kokkonen was a Finnish composer. He was one of the most internationally famous Finnish composers of the 20th century after Sibelius; his opera The Last Temptations has received over 500 performances worldwide, and is considered by many to be Finland's most distinguished national opera.-...

, and Aleksis Kivi

Aleksis Kivi

Aleksis Kivi , born Alexis Stenvall, was a Finnish author who wrote the first significant novel in the Finnish language, Seven Brothers...

 are on the edges of the lake.

In 1992, as part of restoration efforts to improve the quality of water in the lake, additional water started to be fed into the Lake via the Päijänne Water Tunnel

Päijänne Water Tunnel

The Päijänne Water Tunnel , located in Southern Finland, is the world's second longest continuous rock tunnel . It is long and runs 30–100 meters under the surface in bedrock...

.