Around Karijoki stream there is a mixed bag of habitats that includes mires, pine forest and small waterlogged forests. Alongside the stream there is a haymaking meadow from times past. In the east part of the reserve lies a beautiful ravine 20–40 metres across. The area is 0.9 square kilometres in size.
Vinsanlehto lies about 20 kilometres west of Korpilombolo. Logging roads between Gustavsberg and Narken pass through the reserve.