Now we have a full list of Amazon local stores. You can find it in Advanced settings of Amazon Feeds generator. Each locale has its own list of product departments (categories).
Please note, you have to be registered with a local Amazon affiliate program to be able to generate affiliate feeds from a local Amazon store.
Here is the list of available Amazon locales: Australia, Brazil, Canada, France, Germany, India, Italy, Japan, Mexico, Netherlands, Singapore, Spain, Turkey, United Arab Emirates, United Kingdom, United States.