[Fixed]-Django: I can't succeed displaying multiple checkboxes in my template

From your code sounds like you want to limit the choices of region your project can have. I think you should create an admin for RegionChoices first. In there you could create entrances of RegionChoices you like. Follow the django docs if you are not sure how to create an admin interface for a model https://docs.djangoproject.com/en/1.8/ref/contrib/admin/

ps: You might want to do unique=True on region field in RegionChoices. Otherwise you might create duplicate entries of the same region by accident.