A narrow continuous run through the Coed Brenin forest. No nasties although there is usually some woodwork to sneak around at some point.
Takeout at the public toilets in Ganllwyd, from here there is easy access down the bank to the river. To reach the putin head north along the A470, then take a small left turn just before Bronaber down to a bridge over the river. Alternatively, head into Coed y Brenin across the river and you can access the river from their main carpark.
Rainchasers is best experienced as an app.