Route Col de Beretin from Geneva  

Beatuful route from Aire-la-Ville untill Collonges via little pitoresque wine villages. Collonges - Bellegarde is a busy route, so try to stay off the main route as much as possible. Same goes for Saint German de Joux - Bellegarde.

The real reward, however, is the ride from Bellegarde to Col Cuvey and Beretin. Superb Jura routes.

The loop back to Geneva is not included in the description. I recommend taking to Pougny and continue on the French side of the river.