I fished through all the data... and found that there are several errors concerning the rivers. For example a river in the north is river for awhile then turns to nothing but artic, although the graphic is river. (not sure if that is intended). Also, when sifting through the data where there should be rivers there is nothing although rivers show up on the map appropriately.
Also, the first river that you found on the edge I don't think is included with the mapriver data.
There are quite a few other random river pieces floating around the map as well.
