Lake Pielinen is the fourth largest lake in Finland, located in the North Karelia region. It covers an area of approximately 1,100 square kilometers and is known for its clear waters and beautiful natural surroundings. The lake is part of the Pielinen River system and is a popular destination for fishing, boating, and other recreational activities. The lake is surrounded by several towns, including Lieksa and Nurmes, which offer access to various amenities and services. Lake Pielinen is also home to numerous islands, with Koli National Park nearby, providing opportunities for hiking and enjoying the scenic landscapes.