Very picturesque Lake Tuulos lies in the centre of the Tuulos National Park. The area of the Lake accounts for 99 km2, and the length is 40 km. Numerous islands unite in chains, now and then they form steep ridges. A traveler will meet here both flat shores and narrow channels. The Lake is surrounded by a labyrinth of small lakes and channels going far in the depth of the forest. Gently sloping shores of the Lake provide good conditions for fish breeding and spawning, but for traveler it is very difficult to move there.
Lake Tuulos gives a head to the River Luzhma, which drives its water to the west, in Finland, where it falls into Lake Ruuna. Until the 1970s this rapid river was used for floating. From the Finnish side the River is called Tuulijoki.
The Lake is ringed with forest taking turns with small mires, narrow and long, matching well with the Lake.
In the 1950-1960s, forest harvesting was practiced here, and the traces of the harvesting operations are still seen. Rough and dense forest stands alternate with sites of young deciduous and mixed forest.
The idea of a National Park was moved by the Karelian Research Centre of the Russian Academy of Sciences in 1992. Later, a series of decisions was made in favour of the establishment of the Park both at federal level and at the level of the Government of the Republic of Karelia. The development of the territory was supported by the Ministry of Environment of Finland and the Ministry of Agriculture and Forestry of Finland. Upon initiative of the Tacis Project "Karelia Parks Development" ENVRUS 9704 and the Local Administration of the Muezersky District an office of the Park was set up in 1999.