The walk starts at the end of Chemin de Rosainruz, behind Rimogne secondary school.
(S/E) Take the path leading to the lake and follow it along the eastern and then northern banks.
(1) Cross the stream channelled by large slabs of slate quarried in the commune. Continue along a gravel path which is in fact an old railway line.
(2) After passing private land on the left, at a major crossroads, turn right and then keep to the left (west) of the stream. After 150 metres, take the small path on the right that follows the stream and climbs gently for about 1,500 metres (this path does not appear on the IGN map). After leaving the stream, join the Bérulle forest road.
(3) Turn right and continue for 700 metres before turning right towards the Étang de la Passée.
(4) Walk along the lake and its marshy shore (avoid if it has rained heavily!) and head south to find the paths along the edge of the plot to the south and west, staying at roughly the same altitude.
(5) When the path begins to descend, turning eastwards, you will approach the Richolle stream, which you can hear, but you are now on its eastern bank. Join a wide path heading south-east.
(6) Walk along a quarry on your left.
(7) Almost opposite the access road to the quarry, find a small path on the right that leads back to the old railway line. Take this path on the left and leave it almost immediately to cross the Richolle again at the same point as on the way out.
(1) Follow the same route as on the way there to return to the starting point (S/E).