Bohemia was a European Monarchy in at least the 17th and 19th centuries.
Geography
Bohemia was located in Central Europe, (AUDIO: Grand Theft Cosmos) and in central Bohemia were Castle Houska and Kokorin Forest. (COMIC: Herald of Madness)
History
In 1601, the Thirteenth Doctor, Graham O'Brien, Ryan Sinclair, and Yasmin Khan met Tycho Brahe and Johannes Kepler in Kokorin Forest (COMIC: Herald of Madness)
In 1898, the Headhunter posed as Elizabeth of Bohemia in order to gain access to Drottningholm Palace. Grand Theft Cosmos)