(S) From the Vens refuge, head down and follow the lake to the right. The path stays on the right-hand bank at all times; do not cross the torrent. Walk in this way from lake to lake through very picturesque scenery, passing a succession of glacial moraines and a beautiful waterfall. Reach marker 26.
(1) Cross a footbridge over the spillway of the third lake and begin the fairly steep climb towards the Babarottes ridge. Reach Lac des Barbarottes.
(2) Pass to the right of the lake and climb up the right-hand side via a series of switchbacks to reach a small hollow.
(3) From the summit, descend on the other side; the official path initially veers slightly to the right – do not follow the track heading straight ahead, as the former offers better footing. You will reach the rocky scree below.
(3) Follow the barely visible path on the left to reach the Chemin de l’Énergie.
Be careful here: if you come across marker 113, you must turn back to return to the previous junction.
(4) Turn right onto it, then follow a perfectly flat path; progress is quicker and the going is easy. You’ll reach marker 112.
(5) Continue to follow the Chemin de l’Énergie to the left. Pass through two small tunnels and you’ll reach the barracks overlooking the Plan de Ténibre at marker 111.
(6) Important note here: in August 2020, the Mercantour National Park was still carrying out stabilisation work on the Chemin de l’Énergie following a rockslide. This route follows the diversion put in place by the authorities at that time. Allow for an additional 200 metres of ascent/descent and 1 hour to 1 hour 30 minutes’ walking time on top of the walking times indicated on the signposts. In the absence of specific signposting on the ground, continue to follow the Chemin de l’Énergie.
At marker 111, the path is blocked. Take the diversion to the left via Lac Fer, following the clearly visible yellow signposts. Climb the steep slope through a scree slope to reach Lac Fer.
(7) Walk to the right of the lake, facing Mont Ténibre. Descend on the other side via an easier, specifically signposted path to return to the Chemin de l’Énergie above the small Lac Pétrus.
Turn left onto it, then keep left at marker 110 towards the Rabuons refuge. Pass in front of some old hay-drying racks. You’ll reach the junction at marker 103.
(8) Turn left again; you’re still on the Chemin de l’Énergie. You’ll then enjoy the most impressive section of the route. The path is carved directly into the cliff face and passes through several tunnels until you reach marker 104.
(9) Turn left and head uphill towards Lake Rabuons. Pass behind an EDF hydroelectric power station. Reach the lake’s old spillway. You will then come to marker 105; take the path on the left and cross a footbridge towards the CAF refuge at Rabuons (E).