Alta Via Canavesana now enters Gran Paradiso National Park. From Villa Poma to Ceresole Reale, we follow the lakeside asphalted road to the left as it passes the hydro-electric power station and then Villa and Mua (50 minutes from Villa Poma), where we find the signposts for the route for Lago Lillet. Passing through a larch tree wood, we climb up near the Alpe Pisson 2082 m. The climb continues first below a rocky cliff, then on to the Alpe del Medico 2474 m reaching the wide Royal Hunting Road that links Colle della Terra with the Colle della Porta, just east of the lovely Lake Lillet 2765 m (3.5 hours from Mua). We follow it to the right passing through a stone scree (snow can be found somewhere even in late summer) and reach the Colle della Porta 3002 m. From the Colle, the Royal Road is a winding descent along the opposite slope between snowfields and detritus towards the Bivouac Giraudo. At approximately 2700 m above sea level the mule track veers to the right; we leave it and continue left, following signs leading us between the large blocks of a stone scree up to Lago della Piatta and to the nearby Bivouac Giraudo 2630 m (6 sleeps, always open, water found nearby). (2.5 hours from Lago Lillet).