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Le tour des Écrins is a hiking loop trail in southeast France in the Alpes, going round the Écrins mountain range. It is also known as GR54 (GR = Grande Randonnée). It is similar to the TMB (tour de Mont Blanc) but way less crowded.
I was there in the first half of September 2020, starting in La Grave and finishing in Le Bourg d’Oisan, which means about 150 km trail with >10.000 m elevation change each uphill and downhill.
Though there are lots of “refuges” (managed mountain huts) it is also possible to hike there with a tent, which is the preferable way during covid times.