Hiking the Northern section of the GR20 is regarded as more demanding than hiking the GR20 South. From Vizzavona to Asco, the GR20 North winds through some incredulous mountain terrain, over the highest cols, past glacial lakes, down deep chasms and bare granite slopes and across almost impassable barriers equipped with hand chains and ladders. There are many steep ascents and descents, the ambience is strictly alpine. The Northern section encompasses the famous cirque de la solitude, that you will come across during an impressive section of the GR20 that is mineral in character. Hiking the GR20 North has gained a status as one of the most difficult treks.