The Martinselkonen Nature Reserve is forest area in northern Kainuu. Actual Kainuu forest type are that offers diverse opportunities for hiking, fishing and berry picking. Martinselkonen is part of the Kalevala Park protected area complex.
The area has a moderately old, pine-forested forest with signs of deforestation. There are plenty of bogs, ravens and swampy fabrics lined with reels. Floating structures can be seen along the Karttimojoki River, located on the western border of the area.