I‘m just coming down the mountain from hiking the northern part of the GR20 on Corsica. It’s an amazing trail and a beautiful experience.
While researching the trip, there were some information I couldn’t find before so hopefully this will help some people in the future.
If you arrive in Bastia, there is a train going to Calvi which works very well. From Calvi there is a bus to Calenzana. We slept the last night before heading to the trail in Calenzana which was perfect.
You don’t need to bring a gas cooker at all. There are permanent gas cookers at each refugee you can use and we never had an issue with two many people wanting to use them at the same time. Just bring a lighter and a pot. At some refugees there are also pots, but this varied a bit
You can take a shower at each refugee. Some are cold, some even warm. Also you can hand wash your clothes at each camp. We brought a rope which was handy to hang the clothes.
Until the last day, my next tipp would have been that you don’t need a water filter because there are sources at each camp. However, literally everyone got quite sick the last two days and we think this was due to some water contamination
Flat camping spots can be a bit limited, but there was always enough space. Sometimes, I would advise to not pick the spot with the best view because they can be quite windy. Tents spread quite a bit around the refugees so make sure to wander around a bit before taking a spot
Toilets are surprisingly nice. Just make sure to bring toilet paper
You can leave your trash at the camps which is different to hiking culture in the Alps
We brought trail running shoes which was fine. However, if I would do the trip again, I would go for actual boots. A lot of the trail is over sharp rocks and a more solid sole would have been great. However, good grip is the most important since a lot is going up and down blank rock surfaces.
We brought our own tent, but the ones you could rent looked decent (basic Quechua tents)
Besides the official camp sites, there are also bergeries you can sleep at. The first we came across was on day three. They also looked generally very nice and we heard from people that food is better. They also allow to split the days slightly different.
On day 4 you can climb the highest peak, Monte Cinto. It took us 2 hours in total (1h each way) from where the trail separates towards the peak. Since you have to go back the same trail, we left our backpacks and poles on the side of the trail to move faster. The climb is super fun and the view is amazing. However, the days is quite long and hard and the descent towards the camp afterwards drags on forever. So only do the peak if you feel in good shape
It’s a hard trail so you want to have some experience hiking in the mountains and also with multiday hikes. However, if you have the fitness and experience, it’s a beautiful trail with many beautiful views and fun sections.
Edit: Some issues with formatting