 They came to be known as the Czech lands after the fall of the Empire, and the rise of the First Czechoslovak Republic, when the term Bohemia (), which also refers to the core region of the former kingdom, was no longer deemed acceptable by those in Moravia and Czech Silesia (historically, other two core lands of the Bohemian Crown).These three integral Czech lands (Bohemia, Moravia and Czech Silesia) now form the boundaries of the Czech Republic.Humans had settled in the region by the (Lower Paleolithic) (2.5mil – 300,000 BP).