Pleasant touring or beginners run.
Lots of access/egress points on the run mean length can be adjusted to suit. Suggested putin is at Enzieholm Bridge, about 14km north of Langholm; takeout out at Langholm for a grade 1 trip, or continue downstream onto the next section (gd 2/3) to Hollows Bridge or Canonbie.
Rainchasers is best experienced as an app.