You bet. There are a bunch of ways you can do it, but here's one potential method @Rashomon. For the set of points along each river bank, add new fields to the attribute table for Xcoord and Ycoord. Then open field calculator and use the $x and $y functions to populate the fields. You can then use anything you want to compute a simple average of the two sets of coordinates. Even Excel will work. Then just plot your new x and y coordinates that correspond to the center of the river. – lambertj Jan 25 at 16:44