"Bohemia is in Czechia."
Translation:Čechy jsou v Česku.
Why Bohemia is it Čechy. I thought it is the name of a region in CR.
You're correct. Bohemia is a historical region in the Czech Republic. In Czech, it is called "Čechy". The other name used in the above sentence "Česko" is short for "Česká republika" and refers to the whole country (ie. not just Bohemia, but also Moravia and Silesia).
Čechy = Bohemia
Česko = Czechia