Sudetenland
Sudetenland (Czech and Slovak: Sudety, Polish: Kraj Sudetów) is the German name (used in English in the first half of the twentieth century) for the northern, southwest and western regions of Czechoslovakia inhabited mostly by ethnic Germans, specifically the border areas of Bohemia, Moravia, and those parts of Silesia located within Czechoslovakia.
Read more about Sudetenland.