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Follow the bisse until it takes water.
For the return you can loop by La Rimble or Mayens de Praz.
These two return trips start where the bisse takes water.
For La Rimble, climb towards the Mase pastures and for Mayens de Praz follow the sign-posts for Sentiers Didactiques descending, cross Mayens de Parz and join the forest road (GPS 46°11’47’’ N 7°27’30’’ E) which climbs in the direction of the bisse to reach your starting point. Can also be done in winter (but you may not see much running water!).