The Chaine du Bargy is a brilliant area approximately one hour from Saint Gervais. It is very popular with road cyclists where the principal challenge is the Col de la Colombiere. Rosie and I cycled this yesterday.
Today, we climbed on the Falaise de la Colombiere. This gives excellent routes on quality limestone up to 80 metres high. I have climbed on other cliffs in this area previously. For example, on the 4th September 2012 Martin and I climbed on the Pointe Du Midi. A report can be found on the blog.
I would recommend this area to anyone who likes climbing multi pitch limestone, completing via ferratas, hill walking or road cycling in a beautiful unspoilt area which receives lots of sunshine.