From Névache, take the D 301T towards the Upper Valley and park at the end of the road in the Laval car park (2030 m).
(S/E) Walk to the end of the road and, at the roundabout, turn right. Walk to the back of the car park (often full) then head east-northeast and take the small path in the same direction.
This crosses the Ruisseau de Saint-Jacques, then climbs and heads east-southeast for about 300 m before turning north-east, gradually approaching the Cula torrent, which it joins.
(1) Then follow the right bank of the torrent off-trail, heading north-north-east then east-north-east (azimuth 70°) through the wide valley, keeping well to the left of it.
During the ascent, do not cross the torrent, even though an initial footbridge invites you to do so.
(2) At an elevation of 2362 m, cross the stream and move to the left bank (i.e. to the right of the stream as you ascend).
Then head north-east then north-north-east to join theGR®® of the Grand Tour du Thabor.
(3) Continue along theGR®® to the right and cross the second branch of the Cula stream via the footbridge.
(4) Immediately afterwards, at the junction, take the path on the left heading south-east which climbs towards Lac de Cula (cairns).
(5) A short walk around the lake is a must; I suggest you climb the small hill to the west of the lake, marked by two superb cairns, to enjoy the magnificent view of the Cerces massif.
To return, head back to the footbridge.
(4) Cross it and continue to the next junction.
(3) Leave the path you took on the way up and continue along theGR®® Grand Tour du Thabor. After an almost horizontal traverse along the western slope, this path descends towards Laval, joining a track which you simply take on the left and follow to the car park (S/E).

