Erik "Eero" Nikolai Järnefelt was a Finnish painter and art professor. He is best known for his portraits and landscapes of the area around Koli National Park. He was a medal winner at the Paris Exposition Universelle of 1889 and 1900, and he taught art at the University of Helsinki and was chairman of the Finnish Academy of Fine Arts.

Koli National Park is a national park in the municipalities of Joensuu, Lieksa and Kontiolahti in the North Karelia region of Finland. It covers 30 square kilometres (12 sq mi) of forested hills on the western shore of Lake Pielinen. The park was established in 1991 and is currently governed by the Metsähallitus. It was originally governed by the Finnish Forest Research Institute, which is also called the Metla.