Keitele is a large lake located in Central Finland. With the area of 493.59 km2 it is the 9th largest lake in the country. The lake is divided into three regions, Ylä-, Keski-, and Ala-Keitele, of which Keski-Keitele is the largest. Water in the lake is clear and in excellent condition. The towns of Äänekoski and Viitasaari are located on the shores of Keitele.
The northernmost part of the lake is called Ylä-Keitele. A big part of Ylä-Keitele belongs to Natura 2000 protection program due to its clear water and natural condition.
Wikipedia https://en.wikipedia.org/wiki/Lake_Keitele
Coordinates 62°53'16.149" N 25°57'13.131" E