For anyone visiting France, here is a great site to see European Otter.
Stéphane Raimond, a former pisciculturist, has built some years ago a blind where he welcomes wildlife watchers and photographers to observe wild otters that visit his site.
His website: http://www.objectif-loutres.com/accueil-de-photographes-animaliers/
An a couple of nice videos: https://www.youtube.com/watch?v=48RvLHs5Eoo
Including the trailer of a movie recently shot at his place: https://www.youtube.com/watch?v=9oxmhhlj6ME