Question

Where were the concentration camps?

Answer 1

There were many, and not only German ones. I assume in the context of this site you mean the World War II German camps.

Explanation:

The list is extensive, so the following link to a detailed map may be more helpful. It also include the ones in the U.S. for Japanese.

https://images.search.yahoo.com/yhs/search;_ylt=AwrgEY8K6tFaB4AAc4sPxQt.;_ylu=X3oDMTByNWU4cGh1BGNvbG8DZ3ExBHBvcwMxBHZ0aWQDBHNlYwNzYw--?p=Concentration+Camp+locations&fr=yhs-ddc-linuxmint&hspart=ddc&hsimp=yhs-linuxmint

Answer 2

As far as Germany is concerned all over Germany with a few transit camps in the western European occupied countries, but the most infamous ones with in Poland and the Ukraine

Explanation:

http://www.historyplace.com/worldwar2/holocaust/pop-up-map.htm

You will see the death camps were exclusively in the East