Nilakka is a rather large lake in Northern Savonia,

Finland Finland ( fi, Suomi ; sv, Finland ), officially the Republic of Finland (; ), is a Nordic country in Northern Europe. It shares land borders with Sweden to the northwest, Norway to the north, and Russia to the east, with the Gulf of B ...

. With the area of nearly 169 km² it is the 25th largest lake in the country.Lakes by size
in Järviwiki Web Service. Retrieved 2014-03-17. It's a shallow lake, connected by canals to upper

Lake Pielavesi Pielavesi is a large lake in the Kymijoki main catchment area in Northern Savonia, Finland. It is situated in the municipality of Pielavesi.

and lower

Iisvesi Iisvesi is a rather large lake in Finland. The lake consists of three separate basins: Iisvesi, Virmasvesi and Rasvanki. Located within Tervo, Rautalampi, Suonenjoki Suonenjoki (; literally means "vein's river") is a town and municipality of Fin ...

References

Kymi basin Landforms of North Savo Lakes of Keitele Lakes of Tervo Lakes of Pielavesi {{EasternFinland-geo-stub