This Bous or Piornedo stream starts in Penalonga and flows into the As Pontes river (a tributary of the river Ser). Throughout its course it forms several small waterfalls, pools and rapids.

It can be seen on its route from Piornedo to Mustallar, on the road that goes from Campo da Braña to Piornedo (before reaching Donís) or at the mouth, when it joins the As Pontes river.

IMPORTANT: It is not easy to see it as you have to cross the bridge and go through an area with a lot of undergrowth and a steep slope towards the river.