Start from Cortina centre along state road 51 to Dobbiaco, turn left to Cadin and take trail 416/409 to Passo Posporcora.
On the way down, turn into trails 401 and 404 and climb up Val Travenanzes to Forcella Col dei Bos. Go over the col and descend along trail 402, then turn left and climb up trail 423.
Descend to Col Gallina, cross the road and continue downhill on trail 424 and then take trail 440 to 5 Torri.
From there, climb up to Rifugio Averau, go over the col and descend on dirt road until you meet trail 452 on your left. Follow the trail to Passo Giau, cross the road, climb up trail 436 to Forcella Giau and Forcella Ambrizzola, then descend along trail 434 to Croda da Lago.
From the lake, follow trail 431 to Lago d'Ajal and then continue on 428 to Mortisa and down to Cortina.