Rokua esker

Rokua esker traverses the entire Rokua Geopark area. The esker consists of gravel and sand deposited by glacial meltwater. Gravel was deposited in ice tunnels where meltwater ran. At the edge of the ice sheet, meltwater burst out, and deposited sand into a delta. On Rokuanvaara Hill, the esker and delta deposits are 100 metres thick in places. The fin-grained sand of the deposits originates to the sediment rocks of Muhos formation. Typical vegetation of the sandy esker area are snow-white lichen heaths and pine forests.