The basin area of the Vila-joki River is 344 km2, covering parts of Finland (73.4%) and Russia (26.6%). In the Finnish part of both of the basins, there arc several lakes and a few regulated reservoir dams. The basin area of the Vaalimaanjoki River is 245 km2, mostly situated in Finland (97.4%) On the Finnish side of the border, there are some old water and saw-mill structures, which are no longer in use.