The Twelve Bens, or Twelve Pins are also known in Irish as Na Beanna Beola. This mountain range made of of sharp-peaked quartzite is located northeast of Roundstone. Frequent rainfall and steep-sided mountains produce an abundance of small trickles and streams which descend into wide-bottomed valleys below the Twelve Pins to join larger streams with riffles and pools. The highest point in the Twelve Bens is Benbaun at 729 metres.