Is it der die or das bavaria?

Bavaria ist not German, the German word is Bayern. It is a proper noun and has no article in front of it. The State (the State of Texas) is das Land in German (das Land Bayern).
==============================================================

Its die Bavaria. She is the patron of Bavaria. Her most famous statue can be seen in Munich outside the Ruhmeshalle (Hall of Fame) on the Theresienwiese. She is depicted in statues and frescos throughout the city. She is as important to the Bavarians as Britannia is to the British